Question

The class marks of a frequency distribution are given as follows: 15, 20, 25, ... The class corresponding to the class mark 20 is ______.

Options

• 12.5 – 17.5

• 17.5 – 22.5

• 18.5 – 21.5

• 19.5 – 20.5

Answer 1

The class marks of a frequency distribution are given as follows: 15, 20, 25, ... The class corresponding to the class mark 20 is 17.5 – 22.5.

Explanation:

Since, the difference between mid-value is 5.

So, the corresponding class to the class mark 20 must have difference 5.

Therefore, option (c) and (d) are wrong.

Since, the mid-value is 20 which can get only, if we take

`(17.5 + 22.5)/2 = 40/2` = 20