Question

The marks obtained (out of 20) by 30 students of a class in a test are as follows:

14, 16, 15, 11, 15, 14, 13, 16, 8, 10, 7, 11, 18, 15, 14, 19, 20, 7, 10, 13, 12, 14, 15, 13, 16, 17, 14, 11, 10, 20.

Prepare a frequency distribution table for the above data using class intervals of equal width in which one class interval is 4-8 (excluding 8 and including 4).

Answer 1

First, we have to arrange marks obtained (out of 20) by 30 students in an ascending order.

= 7, 7, 8, 10, 10, 10, 11, 11, 11, 12, 13, 13, 13, 14, 14, 14, 14, 14, 15, 15, 15, 15, 16, 16, 16, 17, 18, 19, 20, 20.

Now, we will draw the frequency table of the given data.