Question

Find the actual (or true) lower and upper class limits and class-marks (or mid values) of the following classes: 2.1 - 4.0, 4.1 - 6.0 and 6.1 - 8.0.

Answer 1

Classes: 2.1 - 4.0, 4.1 - 6.0 and 6.1 - 8.0
Since classes are inclusive, we have

Adjustment factor 

= `(4.1 - 4.0)/(2)`

= `(0.1)/(2)`
= 0.05

True Lower Limit	True Upper Limit	Class - Mark
2.1 - 0.05 = 2.05	4.0 + 0.05 = 4.05	3.05
4.1 - 0.05 = 4.05	6.0 + 0.05 = 6.05	5.05
6.1 - 0.05 = 6.05	8.0 + 0.05 = 8.05	7.05