Question

Construct the cumulative frequency distribution for the given data.

Age​ (years) of Best Actress when award was won	Frequency
​20-29	2828
​30-39	3737
​40-49	1414
​50-59	22
​60-69	77
​70-79	22
​80-89	22

Age​ (years) of Best Actress when award was won	Cumulative Frequency
Less than 30	nothing
Less than 40	nothing
Less than 50	nothing
Less than 60	nothing
Less than 70	nothing
Less than 80	nothing
Less than 90	nothing

Answer 1

Using given frequencies we calculate cumulative frequency

Age (years) of Best Actress When award was won	Cumulative Frequency
Less than 30	28
Less than 40	= 28 + 37 = 65
Less than 50	= 65 + 14 = 79
Less than 60	= 79 + 2 = 81
Less than 70	= 81 + 7 = 88
Less than 80	= 88 + 2 = 90
Less than 90	= 90 + 2 = 92

Note:

Cumulative Frequency : Cumulative frequency is defined as a running total of frequencies. Cumulative frequency can also defined as the sum of all previous frequencies up to the current point.

In above frequency table there is a repetation of frequency that means 28 written as 2828 and 37 as 3737 so calculating cumulative frequency we not consider frequencies are 28, 37, 14, 2, 7, 2, 2