Q7 of 141 Page 8

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

x:

3

5

7

9

11

13

y:

6

8

15

p

8

4

Given,

Mean = 7.68

= 7.68

9p + 303 = 7.68 (p + 41)

9p – 7.68p = 314.88 – 303

1.32p = 11.88

p = = 9

Find the value of p for the following distribution whose mean is 16.6

x :	8	12	15	p	20	25	30
y :	12	16	20	24	16	8	4

Find the missing value of p for the following distribution whose mean is 12.58

x:	5	8	10	12	p	20	25
y:	2	5	8	22	7	4	2

Find the value of p, if the mean of the following distribution is 20.

x:	15	17	19	20+p	23
y:	2	3	4	5p	6

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 year):	15	16	17	18	19	20
No. of students:	3	8	10	10	5	4

Find the missing frequency (p) for the following distribution whose mean is 7.68.x:35791113y:6815p84