Question

1. The mean of the following data is 42. Find the missing frequencies x
and y if the sum of frequencies is 100.
Class interval
0-10 10-20 20-30 30-40 40-50 50-60 | 60-70 | 70-80
Frequency
7
10
х
13
у
10
14
9
[CBSE 2014]​

Answer 1

Answer:

1. The mean of the following data is 42. Find the missing frequencies x

and y if the sum of frequencies is 100.

Class interval

0-10 10-20 20-30 30-40 40-50 50-60 | 60-70 | 70-80

Frequency

7

10

х

13

у

10

14

9

[CBSE 2014]