Question

The S.D. of 20 items is 15 and if each item is decreased or increased by 1, then standard deviation will be ______.

Options

• 16

• 17

• `91/15`

• 15

Answer 1

The S.D. of 20 items is 15 and if each item is decreased or increased by 1, then standard deviation will be 15.

Explanation:

The standard deviation of a data set remains unaltered if each item is increased or decreased by the same constant.