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Q1.
Find the mean deviation about the mean for the following data:
.
Q2.
Find the mean deviation about the median for the following data
.
Q3.
Find the mean deviation about the mean for the following data:
Q4.
Find the mean deviation about the median for the following data
Q5.
5
7
9
11
13
15
17
2
4
6
8
10
12
8
Find the mean deviation about the mean for the following frequency distribution:
Class
30-40
40-50
50-60
60-70
70-80
80-90
90-100
Frequ-
3
7
12
15
8
3
2
ency
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Page 1 of 5
Q6.
Find the mean deviation about the median for the following distribution:
Class
0-10
10-20
20-30
30-40
40-50
50-60
Frequ-ency
6
8
11
18
5
2
Q7.
Find the variance for the following data:
.
Q8.
Find the standard deviation of the following data:
Q9.
Find the variance of the following data:
Q10.
Find the standard deviation of the following data:
Q11.
Using shortcut method, find the mean, variance and standard deviation for the
following data:
Q12.
Using shortcut method, find the mean, variance and standard deviation for the
following data:
.
Class
0-10
10-20
20-30
30-40
40-50
Frequ-
5
8
15
16
6
ency
© Copyright 2011 - 12 Educomp Solutions Ltd.
Page 2 of 5
Q13.
Find the mean, variance and standard deviation for first six odd natural numbers.
Q14.
The mean and variance of the heights and weights of the students of a class are
given below:
Q15. Calculate coefficient of
variation from the following information:
Q16.
If the standard deviation of the numbers
values of .
Q17.
The following results show the number of workers and the wages paid to them in
two factories
:
Q18. The following is the record of goals scored by team
© Copyright 2011 - 12 Educomp Solutions Ltd.
is
, calculate the possible
in a football session:
Page 3 of 5
Q19. Calculate the mean and the coefficient of variation of the marks obtained by
students if the standard deviation is given to be
:
.
Q20.
Coefficient of variation of two distributions are
respectively, and their
standard deviations are
respectively. Find their arithmetic means.
Answers
A1.
A2.
A3.
Ans:
A4.
Ans:
A5.
A6.
A7.
A8.
A9.
A10.
Ans:
A11.
Ans:
A12.
A13.
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Page 4 of 5
A14.
A15.
A16.
A17.
Factory
A18.
Team
has more variation in wages.
.
A19.
A20.
.
.
© Copyright 2011 - 12 Educomp Solutions Ltd.
Page 5 of 5
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