We are given the data for a random sample of 20 patients discharged from a particular hospital.
13,9,5,11,6,3,12,10,11,7,4,4,2,2,2,10,10,10,12,12
The initial class boundary is 1.5 and the class width is 2.
This means that the first class will start at 1.5 and the next class will be at
1.5+2 = 3.5
3.5+2 = 5.5
5.5+2 = 7.5
7.5+2 = 9.5
9.5+2 = 11.5
11.5+2 = 13.5