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.
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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 =8812=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 
1120 

2130 

3140 

4150 

5160 

6170 

7180 

8190 
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