Q8 of 79 Page 24

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

x:

15

17

19

20+p

23

f :

2

3

4

5p

6

Mean, =

20 =

60 + 20p = 59 + 20p + p²

p² – 1 = 0

p = 1

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

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

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

Find the mean of the following distribution.

x:	10	12	20	25	35
f :	3	10	15	7	5

Candidates of four schools appear in a mathematics test. The data were as follows:

Schools

No. of Candidates

Average Score

III

Not available

If the average score of the candidates of all the four school is 66, find the number of candidates that appeared from school III.

Questions · 79

24. Measures of Central Tendency

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12 13 1 2 3 4 5 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Find the value of p, if the mean of the following distribution is 20.x:15171920+p23f :2345p6