Construct the cumulative frequency distribution for the give

Construct the cumulative frequency distribution for the given data. Construct the cumulative frequency distribution.

Solution

To get the cumulative frequency, we simply add the previous rows, plus the present row.

Thus,

Less than 40   1
Less than 45   1 + 2 = 3
Less than 50    3 + 6 = 9
< 55       9+15 = 24
< 60       24 + 8 = 32
< 65       32 + 7 = 39
<70       39 + 1 = 40