Question

The marks scored by 20 students in a test are given below:
54, 42, 68, 56, 62, 71, 78, 51, 72, 53, 44, 58, 47, 64, 41, 57, 89, 53, 84, 57.
Complete the following frequency table:

(Marks in class intervals)	Tally marks	Frequency (no. of children)
40-50
50-60
60-70
70-80
80-90

What is the class interval in which the greatest frequency occurs?

Answer 1

The frequency table can be completed as follows:

Marks	Tally Marks	Frequency
40$-$50	||||	4
50$-$60	|||| |||	8
60$-$70	|||	3
70$-$80	|||	3
80$-$90	||	2

The class interval with the greatest frequency (8) is 50$-$60.