Definition: A Range is the difference between the highest value and lowest value among the given set observations.
Range = Highest Value - Lowest Value
Go through the following example to further understanding:
Example 1 - Heights of girls (in cm) in a class are as
146, 121, 127, 149, 131, 135, 125, 141, 151, 137
Find the range of girl's height ?
Highest height of girl = 151 cm
Lowest height of girl = 121 cm
Range = Highest height - Lowest height
Range = 151 - 121
Range = 30 cm