What is the range of 16.20, 15.50, 14.40, 16.30, 16.20, 15.40, 16.10, 16.10 and 15.30 mins

First we pull out 16.30 since it is the biggest and then take out 14.40 since it is the smallest

So, we have to subtract the numbers that we took out

Like:

16.30 - 14.40 = 1.90 which can also look like this 16.30 - 14.40 = 1.9

Therefore your answer would have to be: 1.90 aka 1.9

Good Luck!

Range = 16.30 - 14.40 = 1.90

answer

range = 1.90