Cumulative Frequency Distributions. In Exercises 21 and 22, construct the cumulative frequency distribution that corresponds to the frequency distribution in the exercise indicated.

Exercise 5 (Age of Best Actress When Oscar Was Won)

Thegrouped frequency distribution of the ages (in years) of the best actress when the Oscar was won is given.

The cumulative frequency distribution is obtained by adding the frequencies of successive classes. It represents the sum of all frequencies of a class interval equal to and less than it.

The table below shows the frequencies of ages (in years) of the best actress when Oscar was won:

To construct the cumulative frequency distribution, the first class interval should be changed to less than the lower limit of the second class interval; the second class interval should be changed to less than the lower limit of the third class interval, and so on.

The cumulative frequencies corresponding to the classes are obtained as shown below: