The following frequency distribution provides a certain condition prevalence frequency distribution for regions.

Condition (%) Frequency

4- under 5 7

5-under 6 10

6-under 7 18

7-under 8 13

8-under 9 5

9-under 10 3

10-under 1 1 2

A=event that has a prevalence of at least 8%

B=event that has a prevalence of less than 7%

C=event that has a prevalence of at least 5% but less than10%

D=event that has a prevalence of less 9%