1
Question
Find the mean of each of the following frequency distributions :
Class interval:
10−30
30−50
50−70
70−90
90−110
110−130
Frequency:
5
8
12
20
3
2
| Class interval: | 10−30 | 30−50 | 50−70 | 70−90 | 90−110 | 110−130 |
| Frequency: | 5 | 8 | 12 | 20 | 3 | 2 |