The time taken, in seconds, to solve a problem by each of 25 pupils is as follows:
Draw a histogram to represent the frequency distribution.

Given:

The time taken, in seconds, to solve a problem by each of 25 pupils is as follows:
16, 20, 26, 27, 28, 30, 33, 37, 38, 40, 42, 43, 46, 46, 46, 48, 49, 50, 53, 58, 59, 60, 64, 52, 20

To do:

We have to draw a histogram to represent the frequency distribution.

Solution:

Time taken (in sec)	Number of problems
10-20	1
20-30	5
30-40	4
40-50	8
50-60	5
60-70	2
Total	25

 The histogram to represent the given frequency distribution is,