Can anybody explain how to find range on a data set?

To find the range of a set of numbers, you must find the lowest number and the greatest numbers.

For example - (12, 14, 15, 22, 23)

The least is 12 while the greatest is 23.

Just subtract the highest and lowest to find the range.

12 - 23 = 11

so lets say your number set is

9 4 7 3 1 6

you take highest and lowest number so 9 and 1

then subtract 9 - 1 = 8 there you have it