Question

Find the class mark of the class 55 – 60.

Answer 1

Given: Class interval 55 – 60

Step-wise calculation:

Lower limit (L) = 55

Upper limit (U) = 60

Class mark = `("Lower limit" + "Upper limit")/2`

= `(55 + 60)/2`

= `115/2`

= 57.5

The class mark of 55 – 60 is 57.5.