Question

The marks obtained by 40 students of a class are given below:
80, 10, 30, 70, 60, 50, 50, 40, 40, 20, 40, 90, 50, 30, 70, 10, 60, 50, 20, 70, 70, 30, 80, 40,20, 80, 90, 50, 80, 60, 70, 40, 50, 60, 90, 60, 40, 40, 60 and 60
(i) Construct a frequency distribution table.
(ii) Find how many students have marks equal to or more than 70?
(iii) How many students obtained marks below 40?

Answer 1

(i) The frequency distribution table will be shown as below:

Numbers	Tally marks	Frequency
10	||	2
20	|||	3
30	|||	3
40	|||| ||	7
50	|||| |	6
60	|||| ||	7
70	||||	5
80	||||	4
90	|||	3
Total		40

(ii) Students have marks equal to or more than 70 = 5 + 4 + 3 = 12

(iii) Students obtained marks below 40 = 2 + 3 + 3 = 8 students