The district of Rajasthan which touches the boundary of Uttar Pradesh —
A
Bharatpur
B
Jaipur
C
Kota
D
Pali
Question 2Single Answer
Who gave the name "Rajputana" for the Rajasthan State and in which year?
A
Col. Tod; 1806
B
Fahien; 633
C
George Thomas; 1800
D
Max Muller; 1815
Question 3Single Answer
Which of the following districts of Rajasthan has longest boundary which touches Pakistan?
A
Barmer
B
Bikaner
C
Jaisalmer
D
Ganganagar
Question 4Single Answer
Rajasthan Day is organized on —
A
20th March
B
29th March
C
30th March
D
31st March
Question 5Single Answer
Which among the following states not touches the boundry of Rajasthan ?
A
Bihar
B
Madhya Pradesh
C
Punjab
D
Uttar Pradesh
Question 6Single Answer
Which area of Rajasthan State was known as 'Maru Kantar in the Ramayana' ?
A
Bagar Region
B
Shekhawati Region
C
South-East Plateau
D
Western Rajasthan
Question 7Single Answer
Which of the following Pakistani District do not make border with Rajasthan—
A
Khairpur
B
Meerpur Khas
C
Sukkur
D
Tharparkar
Question 8Single Answer
The correct sequence in descending order of the given districts in terms of density of population in 2011 is —
A
Kota, Ajmer, Ganganagar and Churu
B
Jaipur, Bharatpur, Dausa and Alwar
C
Jaipur, Bharatpur, Alwar and Dausa
D
Alwar, Dausa, Ajmer and Churu
Question 9Single Answer
Adjacent district in Rajasthan are —
A
Churu, Jhunjhunu, Jaipur
B
Jhalawar, Bundi, Tonk
C
Sirohi, Barmer, Jaisalmer
D
Sirohi, pali, Nagaur
Question 10Single Answer
State bird of Rajasthan is —
A
Chinkara
B
Godawan
C
Neelgai
D
Peacock
Question 11Single Answer
"KUBADPATTI" of Rajasthan is located at —
A
Banswara - Dungarpur
B
Bharatpur - Alwar
C
Nagaur - Ajmer
D
Kota - Bundi
Question 12Single Answer
The smallest inter-state boundary of Rajasthan is with the state of —
A
Gujarat
B
Haryana
C
M.P.
D
Punjab
Question 13Single Answer
Which place is occupied by Rajasthan in terms of area in the country?
A
First
B
Second
C
Third
D
Fourth
Question 14Single Answer
What is the percentage of area of Rajasthan with respect to the area of India ?
A
4.6 %
B
5.8 %
C
8.2 %
D
10.4 %
Question 15Single Answer
To who did Col. James Tod dedicated his travelague "Travels in Western India" —
A
Lord Minte
B
Lord William Bentinck
C
William Hunter Blair
D
Yati Gyanchandra
Question 16Single Answer
As per 2011 census, the population Rajasthan is —
A
4.32 crores
B
5.8 Crores
C
6.8 Crores
D
7.1 Crores
Question 17Single Answer
Position occupied by Rajasthan related to population of India is —
A
First
B
Fourth
C
Eighth
D
Eleventh
Question 18Single Answer
Areawise place of Rajasthan in the country is —
A
First
B
Second
C
Sixth
D
Ninth
Question 19Single Answer
The Population growth rate in Rajasthan during 2001-2011 can be classified as —
A
High growth with definite sign of slowing down.
B
Rapid high gowth
C
Stagnant population
D
Steady growth
Question 20Single Answer
As per 2011 census the literacy rate of female in Rajasthan is —
A
39.7%
B
46.6%
C
48.0%
D
52.1 %
Question 21Single Answer
What fraction of India's total area is covered by Rajasthan?
A
Around 5%
B
Around 15%
C
Around 10%
D
Around 20%
Question 22Single Answer
Which of the following statements is NOT TRUE?
A
Rajasthan's total geographical area is around 3.42 Lakh Sq. Km.
B
Total Populations of Rajasthan is around 10 crore.
C
Out of total population of Rajasthan, 24.9% people live in urban regions.
D
All of the above
Question 23Single Answer
Which district has highest population in Rajasthan?
A
Jaipur
B
Jaisalmer
C
Udaipur
D
Ajmer
Question 24Single Answer
What fraction of Rajasthan's total area is covered by Thar Desert?
A
Around 30%
B
Around 40%
C
Around 60%
D
Around 70%
Question 25Single Answer
The temple city of Osean in Rajasthan was established by which of the following Rajputs?
A
Gurjar Pratiharas
B
Chauhans
C
Solankis
D
Sisodias
Question 26Single Answer
The Jhamarkotra mines of Rajasthan are best known for which among the following minerals?
A
Mica
B
Zinc
C
Rock Phosphate
D
Lime Stone
Question 27Single Answer
What is the population of Scheduled Caste in Rajasthan?
A
20.3%
B
21%
C
17.8%
D
21.6%
Question 28Single Answer
According to census 2011, what is the literacy rate in Rajasthan?
A
60%
B
78%
C
66%
D
55%
Question 29Single Answer
How many people are working in Rajasthan (in percentage)?
A
56%
B
23%
C
43.6%
D
52.4%
Question 30Single Answer
The word 'Rajputana' for Rajasthan was first used by:
A
James Todd
B
George Thomas
C
Geogra Greeson
D
Kushal Labh
Question 31Single Answer
How many districts are there in Rajasthan in 2021?
A
21
B
16
C
30
D
33
Question 32Single Answer
Rajasthan shares the longest border with which state?
A
Gujarat
B
Madhya Pradesh
C
Uttar Pradesh
D
Haryana
Question 33Single Answer
Which district of the Rajasthan does not touch the international border?
A
Ganganagar
B
Bikaner
C
Barmer
D
Jodhpur
Question 34Single Answer
Which of the following districts of Rajasthan has shortest international boundary?
A
Jaisalmer
B
Bikaner
C
Barmer
D
Ganganagar
Question 35Single Answer
With how many states Rajasthan shares its border?
A
7
B
5
C
6
D
3
Question 36Single Answer
What is the name of the campaign launched by CM Bhajanlal Sharma for water conservation in June 2025?
A
Jal Jeevan Mission
B
Vande Ganga
C
Narmada Abhiyan
D
Save Water Initiative
Question 37Single Answer
Which policy did the Rajasthan government aim to implement to train 1.5 lakh youth in the next two years?
A
Skill Policy
B
Education Policy
C
Health Policy
D
Tourism Policy
Question 38Single Answer
What was the duration of the ‘Vande Ganga’ water conservation campaign launched in June 2025?
A
June 1–15
B
June 10–25
C
June 5–20
D
June 15–30
Question 39Single Answer
Who was assigned special responsibilities for the ‘Vande Ganga’ campaign across 41 districts in Rajasthan?
A
District Collectors
B
Village Panchayats
C
Local NGOs
D
State Ministers
Question 40Single Answer
Which new exploration module was set to be launched by the Ministry of Coal on July 4, 2025, affecting Rajasthan’s coal sector?
A
Mining Safety Module
B
Coal Extraction Module
C
Digital Approval Module
D
Environmental Clearance Module
Statistics
Question 41Single Answer
Which Windows interface element typically appears to display information, a warning, an error message, or a request for confirmation?
A
Window
B
Pop-up menu
C
Message box
D
Taskbar
Question 42Single Answer
What is active desktop ?
A
a term that is synonymous with viewing your desktop as web page
B
a feature to customize your desktop to display informating you can update from the internet
C
both a and b above mentioned
D
A software
E
None of these
Question 43Single Answer
What is meant by an active window?
A
A window that is minimized
B
The window currently receiving user input
C
Any window currently open
D
The window opened first
Question 44Single Answer
What was America Online (AOL) primarily known for during the early popularization of consumer Internet access?
A
An online service providing Internet access and proprietary online content
B
A computer operating system
C
A spreadsheet application
D
A database management system
Question 45Single Answer
An application is
A
word processing, accounting and engineering programs are example of application programs
B
computer program designed to enable users to perform specific job functions
C
Both a and b above mentioned
D
a document
E
None of these
Question 46Single Answer
Which of the following programs enables you to calculate numbers related to rows and columns?
A
Window program
B
Spreadsheet program
C
Graphics program
D
Word program
E
None of these
Question 47Single Answer
The term Briefcase is used for
A
a special folder on the windows desktop used to keep documents up to date when shared between computers
B
a window that us currently open
C
A folder which keeps deleted, files for a while and can be retrieved from it
D
All of the above
E
None of these
Question 48Single Answer
In a graphical user interface, what is a button primarily used for?
A
Executing a command or initiating an action
B
Permanently storing data
C
Displaying the computer's IP address
D
Formatting a disk automatically
Question 49Single Answer
A channel (in windows terminology) is
A
a widely used online service that offers access to the internet
B
a specialized web site designed to work with the windows 98 subscribing feature to automatically download information from the internet and store it on your computer for later viewing
C
an area on the computer memory where text or graphics can be temporarily stored
D
All of the above
E
None of these
Question 50Single Answer
What does a checked checkbox generally indicate in a graphical user interface?
A
The associated option is enabled or selected
B
The application has closed
C
The file has been deleted
D
The computer is offline
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Statistics
Question 51Single Answer
The term classic style implies
A
you can click on an item to select it and double click on an item to open it
B
a folder options setting that tells double click on an item to open it
C
both a and b
D
font style
E
None of these
Question 52Single Answer
The term click implies
A
to quickly push and release the main mouse button when onscreen mouse pointer is positioned over the desired item
B
a button in a dialog box
C
to shut down or exit a dialog box
D
All of the above
E
None of these
Question 53Single Answer
What is the primary function of the Close button marked with an X on a window?
A
Minimize the window
B
Close the associated window or application
C
Maximize the window
D
Move the window
Question 54Single Answer
A command button
A
is a one in a dialog box such as open, close, exit OK or cancel that carries out a command
B
is a symbol that designates the position on the screen where text or codes will be inserted or deleted
C
is a sort on screen from where you can open and manages files and programs
D
is a small button with an X on it
E
None of these
Question 55Single Answer
What is smallest unit of the information?
A
A bit
B
A byte
C
A block
D
A nibble
Question 56Single Answer
A cursor is
A
to make a selection from the document from the document and duplicate it on the clipboard
B
a symbol that designated the position on the screen where text or codes will be inserted or deleted
C
pressing and holding the main mouse button
D
A button in a dialog box
E
None of these
Question 57Single Answer
What is a Database Management System (DBMS)?
A
A structured collection of data only
B
Software used to create, manage, retrieve, and update data in databases
C
A physical device for storing database backups
D
A programming language used only for calculations
Question 58Single Answer
The meaning of cut is
A
to take a selection from the document and move it to the clipboard
B
to cut a document in two unequal parts
C
to cut a document in two equal parts
D
Only b and c are correct
Question 59Single Answer
A setting or action predetermined by the program unless changed by the user is called as
A
pre - determined setting
B
user - setting
C
default
D
setting
E
None of these
Question 60Single Answer
The search back ground and main area of windows where you can open and manage files and programs is
A
wall paper
B
desktop
C
background
D
All of the above
E
None of these
Question 61Single Answer
Which of the following statement is true?
A
statistics is derived from the French word ‘Statistik’
B
statistics is derived from the Latin word ‘Status’
C
statistics is derived from the Italian word ‘Statista’
D
none of these
Question 62Single Answer
Statistics is concerned with _____
A
qualitative information
B
quantitative information
C
either (a) or (b)
D
both (a) and (b)
Question 63Single Answer
Statistics is defined in terms of numerical data in the _____
A
singular sense
B
plural sense
C
either or (b)
D
both (a) and (b)
Question 64Single Answer
Drinking habit of a person is _____
A
an attribute
B
a discrete variable
C
a variable
D
a continuous variable
Question 65Single Answer
Marks of a student is an example of _____
A
a continuous variable
B
a discrete variable
C
an attribute
D
none of these
Question 66Single Answer
Annual income of a person is _____
A
a continuous variable
B
a discrete variable
C
an attribute
D
(b) or (c)
Question 67Single Answer
An attribute is _____
A
a qualitative characteristic
B
a measurable characteristic
C
a quantitative characteristic
D
all these
Question 68Single Answer
Nationality of a student is ____
A
an attribute
B
a discrete variable
C
a continuous variable
D
either (a) or (C)
Question 69Single Answer
The most attractive method of data presentation is ____
A
diagrammatic
B
textual
C
tabular
D
either (a) or (b)
Question 70Single Answer
In tabulation source of the data, if any, is shown in the ____
A
footnote
B
body
C
stub
D
caption
Question 71Single Answer
The mode of presentation of data are ____
A
textual, tabulation and diagrammatic
B
tabular, internal and external
C
textual, tabular and internal
D
tabular, textual and external
Question 72Single Answer
The most accurate mode of data presentation is _____
A
diagrammatic method
B
tabulation
C
textual presentation
D
none of these
Question 73Single Answer
The best method of presentation of data is ____
A
textual
B
tabular
C
diagrammatic
D
both (b) and (c)
Question 74Single Answer
Details are shown by ____
A
charts
B
tabular presentation
C
both (a) and (b)
D
none of these
Question 75Single Answer
The unit of measurement in tabulation is ____
A
box head
B
body
C
caption
D
stub
Question 76Single Answer
In general the number of types of tabulation are ____
A
two
B
three
C
one
D
four
Question 77Single Answer
For tabulation, 'caption' is ____
A
the lower part of the table
B
the main part of the table
C
the upper part of the table
D
the upper part of a table that describes the column and sub-column
Question 78Single Answer
A table has ____
A
four parts
B
two parts
C
five parts
D
none of these
Question 79Single Answer
The entire upper part of a table is known as ____
A
caption
B
stub
C
box head
D
body
Question 80Single Answer
'Stub' of a table is the ____
A
right part of the table describing the columns
B
left part of the table describing the columns
C
right part of the table describing the rows
D
left part of the table describing the rows
Question 81Single Answer
Which of the following statements is not true for tabulation?
A
complicated data can be presented
B
it facilitates comparison between rows and not columns
C
statistical analysis of data requires tabulation
D
diagrammatic representation of data requires tabulation
Question 82Single Answer
Diagrammatic representation of data is done by ____
A
pictures
B
charts
C
diagrams
D
all these
Question 83Single Answer
The relationship between two variables are shown in ____
A
histogram
B
pictogram
C
bar diagram
D
line diagram
Question 84Single Answer
The data collected on the height of a group of students after recording their heights with a measuring tape are
A
primary data
B
continuous data
C
discrete data
D
secondary data
Question 85Single Answer
The quickest method to collect primary data is ____
A
personal interview
B
by observation
C
telephone interview
D
indirect interview
Question 86Single Answer
Some important sources of secondary data are ____
A
international and Government sources
B
private and primary sources
C
international and primary sources
D
government sources
Question 87Single Answer
Data collected on religion from the census reports are ___
A
(a) sample data
B
secondary data
C
primary data
D
either (a) or (b)
Question 88Single Answer
Which method of collection of data covers the widest area?
A
direct interview method
B
mailed questionnaire method
C
telephone interview method
D
all of these
Question 89Single Answer
In case of a rail accident, the appropriate method of data collection is by ____
A
direct interview
B
personal interview
C
indirect interview
D
all of these
Question 90Single Answer
The best method to collect data, in case of a natural calamity, is __
A
personal interview
B
questionnaire method
C
indirect interview
D
direct observation method
Question 91Single Answer
The number of observations falling within a class is called ___
A
density
B
frequency
C
both (a) and (b)
D
none of these
Question 92Single Answer
Classes with zero frequencies are called ____
A
class
B
empty class
C
nill class
D
none of these
Question 93Single Answer
Frequency distribution ____
A
arranges observations in an increasing order
B
arranges observations in terms of a number of groups
C
relates to a measurable characteristic
D
all of these
Question 94Single Answer
The number of "Frequency distribution" is ___
A
two
B
one
C
five
D
four
Question 95Single Answer
The Frequency distribution of a continuous variable is known as ___
A
grouped frequency distribution
B
simple frequency distribution
C
either (a) or (b)
D
both (a) and (b)
Question 96Single Answer
(Class frequency)/(Width of the class) is defined as ____
A
frequency density
B
frequency distribution
C
both (a) and (b)
D
none of these
Question 97Single Answer
The distribution of shares is an example of the frequency distribution of ____
A
a discrete variable
B
an attribute
C
a continuous variable
D
either (a) or (c)
Question 98Single Answer
Tally marks determines ____
A
class width
B
class boundary
C
class limit
D
class frequency
Question 99Single Answer
Mutually inclusive classification is usually meant for ____
A
a discrete variable
B
an attribute
C
a continuous variable
D
none of these
Question 100Single Answer
For determining the class frequencies it is necessary that these classes are _____
A
mutually exclusive
B
not mutually exclusive
C
independent
D
none of these
Question 101Single Answer
If x and y are related by x – y – 10 = 0 and mode of x is known to be 23, then the mode of y is :
A
20
B
13
C
3
D
23
Question 102Single Answer
A man travels at a speed of 20 km/hr and then returns at a speed of 30 km/hr. His average speed of the whole journey is
A
25 km/hr
B
24.5 km/hr
C
24 km/hr
D
None
Question 103Single Answer
A student obtained the mean and standard deviation of 100 observations as 40 and 5.1 respectively. It was later discovered that he had wrongly copied down an observation as 50 instead of 40. The correct standard deviation is
A
5
B
6
C
3
D
7
Question 104Single Answer
For a moderately skewed distribution, quartile deviation and the standard deviation are related by
A
B
C
D
Question 105Single Answer
The median of the data 13, 8, 11, 6, 4, 15, 2, 18 is
A
5
B
8
C
11
D
9.5
Question 106Single Answer
The sum of the squares of deviations of a set of observations has the smallest value; when the deviations are taken from their
A
A.M.
B
H. M.
C
G. M.
D
None
Question 107Single Answer
If two samples of sizes 30 and 20 have means as 55 and 60 and variances as 16 and 25 respectively, then what would be the S.D. of the combined sample size 50 ?
A
5.33
B
5.17
C
5.06
D
5
Question 108Single Answer
If two variables x & y are related by 2x + 3y –7 = 0 and the mean and mean deviation about mean of x are 1 and 0.3 respectively, then the coefficient of mean deviation of y about mean is
A
–5
B
4
C
12
D
50
Question 109Single Answer
Which of the following result hold for a set of distinct positive observations ?
A
A.M > G.M > H.M
B
G.M. > A.M. > H.M
C
G.M > A.M > H.M
D
A.M > G.M > H.M
Question 110Single Answer
Measures of dispersion are called averages of the ____ order .
A
1st
B
2nd
C
3rd
D
None
Question 111Single Answer
For a set of 100 observations, taking assumed mean as 4, the sum of the deviations is –11 cm and the sum of the squares of these deviations is 257 cm. The coefficient of variation is :
A
41.13%
B
42.13%
C
0.13%
D
None
Question 112Single Answer
If the AM and HM for two numbers are 5 and 3.2 respectively, then the GM will be
A
4.05
B
16
C
4
D
4.10
Question 113Single Answer
________ are used for measuring central tendency, dispersion and skewness
A
Median
B
Deciles
C
Percentiles
D
Quartiles
Question 114Single Answer
Which of the following companies A or B is more consistent so far as the payment of dividend is concerned ?
Dividend paid by A : 5 9 6 12 15 10 8 10
Dividend paid by B : 4 8 7 15 18 9 6 6
A
A
B
B
C
Both A & B
D
Neither A nor B
Question 115Single Answer
What is the coefficient of range for the following distribution ?
Class Interval : 10-19 20-29 30-39 40-49 50-59
Frequency : 11 25 16 7 3
A
22
B
50
C
75.82
D
72.46
Question 116Single Answer
An aeroplane flies from A to B at the rate of 500 km/hr and comes back from B to A at the rate of 700 km/hr. The average speed of the aeroplane is
A
600 km/hr
B
583.33 km/hr
C
D
620 km/hr
Question 117Single Answer
For a moderately skewed distribution, which of the following relationship holds ?
A
Mean – Median = 3 (Median – Mode)
B
Median – Mode = 3 (Mean – Median)
C
Mean – Mode = 3 (Mean – Median)
D
Mean – Median = 3 (Mean – Mode)
Question 118Single Answer
___ & ___ are called ratio averages :
A
HM & GM
B
HM & AM
C
AM & GM
D
None
Question 119Single Answer
A sample of 35 observations has the mean 80 and S.D. as 4. A second sample of 65 observations from the same population has mean 70 and S.D. 3. The S.D. of the combined sample is :
A
5.85
B
5.58
C
10.23
D
None of these
Question 120Single Answer
If x and y are related as 3x – 4y = 20 and the quartile deviation of x is 12, then the quartile deviation of y is
A
14
B
15
C
16
D
9
Question 121Single Answer
Extreme values have ____ effect on mode .
A
High
B
low
C
No
D
None of these
Question 122Single Answer
The mean salary for a group of 40 female workers is Rs. 5,200 per month and that for a group of 60 male workers is Rs. 6,800 per month. What is the combined salary ?
A
Rs. 6,160
B
Rs. 6,280
C
Rs. 6,890
D
Rs. 6,920
Question 123Single Answer
The best measure of dispersion is
A
Q.D.
B
M.D.
C
Range
D
S.D.
Question 124Single Answer
If the mean and S.D. of x are a and b respectively, then the S.D. of is :
A
a/b
B
–1
C
1
D
ab
Question 125Single Answer
Suppose a population A has 100 observations 101, 102, 103, ...., 200 and another population B has 100 observations 151, 152, 153, ....., 250. If VA and VB represents the variance of the two populations respectively, then VA/ VB =
A
9/4
B
1
C
4/9
D
2/3
Question 126Single Answer
If there are two groups with 75 and 65 as harmonic means and containing 15 and 13 observations then the combined H.M. is given by :
A
70
B
80
C
70.35
D
69.48
Question 127Single Answer
The G.M. of 4, 6 and 8 is
A
4.17
B
5.32
C
6.14
D
5.77
Question 128Single Answer
The Mean and S.D. for group of 100 observations are 65 and 7.03 respectively. If 60 of these observations have mean and S.D. as 70 and 3 respectively, what is the S.D. for the group comprising 40 observations ?
A
2.03
B
4.03
C
8.03
D
9.33
Question 129Single Answer
The Quartile deviation for the date is
x : 2 3 4 5 6
y : 3 4 8 4 1
A
1/4
B
1/2
C
1
D
0
Question 130Single Answer
If X and Y are two random variables then v(x + y) is
A
v(x) + v(y)
B
v(x) + v(y) – 2v(x, y)
C
v(x) + v(y) + 2v(x, y)
D
v(x) – v(y)
Question 131Single Answer
G.M is a better measure than others when,
A
ratios and percentages are given
B
interval of scale is given
C
Both (a) and (b)
D
Either (a) or (b)
Question 132Single Answer
Mean and S.D. of x is 50 and 5 respectively. Find mean and S.D. of .
A
(1, 0)
B
(0, 1)
C
(1, 1)
D
(0, –1)
Question 133Single Answer
Mean and S.D. of a given set of observations is 1,500 and 400 respectively. If there is an increment of 100 in the first year and each observation is hiked by 20% in 2nd years, then find new mean and S.D.
A
1920, 480
B
1920, 580
C
1600, 480
D
1600, 400
Question 134Single Answer
If 5 is subtracted from each observation of some certain item then its coefficient of variation is 10% and if 5 is added to each item then its, coefficient of variation is 6%. Find original coefficient of variation
A
8 %
B
7.5 %
C
4 %
D
None of these
Question 135Single Answer
The median of x, is 10. Find x where x > 0 .
A
24
B
32
C
8
D
16
Question 136Single Answer
The average salary of 50 men was Rs. 80 but it was found that salary of 2 of them were Rs. 46 and Rs. 28 which was wrongly taken as Rs. 64 and Rs. 82. The revised average salary is :
A
Rs. 80
B
Rs. 78.56
C
Rs. 85.26
D
Rs. 82.92
Question 137Single Answer
Inter Quartile Range is _____ of Quartile Deviation .
A
Half
B
Double
C
Triple
D
Equal
Question 138Single Answer
The sum of squares of deviation from mean of 10 observations is 250. Mean of the data is 10. Find the coefficient of variation .
A
10 %
B
25 %
C
50 %
D
0 %
Question 139Single Answer
If A be the A.M. of two positive unequal quantities X and Y and G be their G.M., then ;
A
A < G
B
A > G
C
A < G
D
A > G
Question 140Single Answer
When mean is 3.57 and mode is 2.13 then the value of median is
A
3.09
B
5.01
C
4.01
D
None of these
Question 141Single Answer
If L1 = highest observation and L2 = smallest observation, then Coefficient of Range =
A
B
C
D
Question 142Single Answer
The equation of a line is 5x + 2y = 17, Mean deviation of y about mean is 5. Calculate mean deviation of x about mean .
A
–2
B
2
C
–4
D
None
Question 143Single Answer
If variance of x is 5, then find the variance of (2 – 3x)
A
10
B
15
C
5
D
– 13
Question 144Single Answer
The harmonic mean of 1, 1/2, 1/3 ... 1/n is
A
1 / (n + 1)
B
2 / (n + 1)
C
(n + 1) / 2
D
1 / (n – 1)
Question 145Single Answer
The mean weight of 15 students is 110 kg. The mean weight of 5 of them is 100 kg. and of another five students is 125 kg. then the mean weight of the remaining students is
A
120
B
105
C
115
D
None of these
Question 146Single Answer
In a class of 11 students, 3 students were failed in a test. 8 students who passed secured 10, 11, 20, 15, 12, 14, 26 and 24 marks respectively. What will be the median marks of the students
A
12
B
15
C
13
D
13.5
Question 147Single Answer
The variance of data : 3, 4, 5, 8 is
A
4.5
B
3.5
C
5.5
D
6.5
Question 148Single Answer
A lady travel at a speed of 20 km/h and returned at quicker speed. If her average speed of the whole journey is 24 km/h, find the speed of return journey (in km/h)
A
25
B
30
C
35
D
38
Question 149Single Answer
Let the mean of the variable 'x' be 50, then the mean of u = 10 + 5x will be
A
250
B
260
C
265
D
273
Question 150Single Answer
Given the observations 4, 9, 11, 14, 37. The Mean deviation about the Median is
is :
.
is 10. Find x where x > 0 .
