To find range the first thing you want to do is line up your numbers from lowest to highest. In this case that would be
27, 31, 33, 34, 35, 36
This will help and save alot of time especially with a large set of numbers. Okay next take the highest and lowest numbers in the set. Then subtract them this will give you your answer. So take 36 and 27.
36−27=9