**i) **Test scores of 20 students for 100 marks are given below

93, 84, 97, 98, 100, 78, 86,100, 85, 92, 55, 91, 90, 75, 94, 83, 60, 81, 95, 77

Range = Maximum value – Minimum value

= 100 – 55 = 45

Length of the class / class interval = 10

[∵ 51 – 60,61 -70]

No. of classes

**ii)** Modal class : 91 – 100

[ ∵ maximum frequency is 10, which

corresponds to the C.l → 91 – 100]

**iii)** Median class : 81 – 90

[∵ N/2 occurs at the cumulative frequency 10, which corresponds to the C.I 81 – 90]