Question

The table below shows a cumulative frequency

distribution of runners' ages.

Cumulative Frequency Distribution
of Runners' Ages

Age Group. Total
20-29 8
20-39 18
20-49 25
20-59 31
20-69 35

According to the table, how many runners are in
their forties?

1) 25
2) 10
3) 7
4) 6

Answer 1

The cumulative frequency distribution shows that there are 25 runners in the age group of 20-49, and 8 runners in the age group of 20-29. Therefore, the number of runners in their forties can be calculated by subtracting the number of runners in their 20s from the number of runners in the age group of 20-49:

Number of runners in their 40s = (Total number of runners in age group 20-49 - Total number of runners in age group 20-39) =( 25 - 18) = 7

Therefore, there are 7 runners in their forties.