Question

For the two frequency distributions given below, the mean calculated from the first was 25.4 and that from the second was 32.5. Find values of x and y.
Class 10-20
20-30
30-40
40-50
50-60
Distribution I Frequency
20
15
10
x
y
Distribution II Frequency
4
8
4
2x
y

Answer 1

Answer:

x=3

and

y =2

Step-by-step explanation:

Summation of fi = 45+x+y

summatiin of f2 = 16+2x+y

summation of fidi = x+ 2y -55

summmation of f2di = 2x+2y-16

Assume Mean = 35

Then solve