Question

# A total of 320 patients were treated at a clinic in the past year for sexually...

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.

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