Question

11. The mean of the following data is 42. Find the missing freg
and y if the sum of frequencies is 100.
Class interval 0-10 10-20 20–30 30-40 40-50 50-60 60-70170-
Frequency 7 10 x 13 y 10 149​

Answer 1

X=-708.4 y=619.4

Using direct method

Answer 2

The values of x and y are 25 and 12 respectively