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RD Chapter 7- Statistics Ex-7.1 Interview Questions Answers

Question 1 : Calculate the mean for the following distribution :

X

5

6

7

8

9

f

4

8

14

11

3

Answer 1 :


Question 2 : Find the mean of the following data:

X

19

21

23

25

27

29

31

f

13

15

16

18

16

15

13

Answer 2 :


Question 3 :

If the mean of the following data is 20.6. Find the value of p. (C.B.S.E.1997)

X

10

15

p

25

35

y

3

10

25

7

5

Answer 3 :


Question 4 : If the mean of the following data is 15, find p. (C.B.S.E. 1992C)

X

5

10

15

20

25

f

6

P

6

10

5

Answer 4 :


Question 5 : Find the value of p for the following distribution whose mean is 16.6.

X

8

12

15

P

20

25

30

f

12

16

20

24

16

8

4

Answer 5 :


Question 6 : Find the missing value of p for the following distribution whose mean is 12.58. (C.B.S.E. 1992C)

X

5

8

10

12

P

20

25

f

2

5

8

22

7

4

2

Answer 6 :


Question 7 : Find the missing frequency (p) for the following distribution whose mean is 7.68.

X

3

5

7

9

11

13

f

6

8

15

P

8

4

Answer 7 :


Question 8 : The following table gives the number of boys of a particular age in a class of 40 students. Calculate the mean age of the students

Age (in years)

15

16

17

18

19

20

No. of students

3

8

10

10

5

4

Answer 8 :