Question

Find the actual lower class limits, upper-class limits and the mid-values of the classes:

10 - 19, 20 - 29, 30 - 39 and 40 - 49.

Answer 1

C. I.	Exclusive C. I.
10 - 19	9.5 - 19.5
20 - 29	19.5 - 29.5
30 - 39	29.5 - 39.5
40 - 49	39.5 - 49.5

In case of frequency 9.5 - 19.5 the lower class limit is 9.5, the upper class limit is 19.5 and mid-value is

`(9.5 + 19.5)/2` = 14.5

In case of frequency 19.5 - 29.5 the lower class limit is 19.5, the upper class limit is 29.5 and mid-value is

`(19.5 + 29.5)/2` = 24.5

In case of frequency 29.5 - 39.5 the lower class limit is 29.5, the upper class limit is 39.5 and mid-value is

`(29.5 + 39.5)/2` = 34.5

In case of frequency 39.5 - 49.5 the lower class limit is 39.5, the upper class limit is 49.5 and mid-value is

`(39.5 + 49.5)/2` = 44.5