Question

A total of 320 patients were treated at a clinic in the past year for sexually transmitted infections (STIs). Excluding 32 cases that resulted from congenital transmission or sexual abuse, construct the limits for a frequency distribution of the remaining cases (288), if the oldest patient was 88 and the youngest 12 years of age.

Answer 1

Result:

A total of 320 patients were treated at a clinic in the past year for sexually transmitted infections (STIs). Excluding 32 cases that resulted from congenital transmission or sexual abuse, construct the limits for a frequency distribution of the remaining cases (288), if the oldest patient was 88 and the youngest 12 years of age.

Range =88-12=76

By taking 8 number of class intervals, the class width = 76/8 =9.5 .

We take class interval width =10.

Since the lowest score is 12, so we might begin with 11 as it is common to let the first class start or end with a number which is multiple of class interval.

Class interval	frequency
11-20
21-30
31-40
41-50
51-60
61-70
71-80
81-90