Question

Unequal Class-Intervals
21. Calculate mean from the following data:
X
0-10
10-20
20-30
Frequency
5
9
20
30-60
60-90
4
12​

Answer 1

Answer:

Mean = 34.8

Explanation:

class intervel is different but the same we do in this bcz only 2 class intervel is changed.. so (30+60)/2 = 45, (60+90)/2 =75