Question

Given below are heights of 15 boys of a class measured in cm:

128, 144, 146, 143, 136, 142, 138, 129, 140, 152, 144, 140, 150, 142, 154.

Find the range of the given data.

Answer 1

Given, height (data) of 15 boys of a class are

128, 144, 146, 143, 136, 142, 138, 129, 140, 152, 144, 140, 150, 142, 154.

Arranging the given data in ascending order, we have

128, 129, 136, 138, 140, 140, 142, 142, 143, 144, 144, 146, 150, 152, 154

Here, highest observation = 154 and lowest observation = 128

∴ Range = Highest observation – Lowest observation

= 154 – 128

= 26 cm