Question

find the arithmetic mean by step deviation method.

Num
0-10
10-20
20-30
30-40
40-50
50-60

Frequency
5
7
12
16
6
4​

Answer 1

Answer :

44.08

Explanation:

f(i) = sigma 50

fiui =. sigma 95.4

and

a = 25 and h = 10

by the formula

a+[ sigma fiui/sigma fi] × h

We get the answer