Question

How to make class intervals continuous in statistics?

Answer 1

In order to make class intervals continuous, you are supposed to subtract 0.5 from the lower limit and add 0.5 in the upper limit.

31-35
36-40
41-45
46-50
51-55
56-60
61-65
66-70
71-75

so the difference between the given range will be the following:

30.5-35.5
35.5-40.5
40.5-45.5
45.5-50.5
50.5-60.5
60.5-65.5
65.5-70.5
70.5-75.5

Answer 2

subtract 0.5 from lower limit and add 0.5 in upper limit.