The answer is C. 71. You add up all the numbers to get 355. and then you divide by the amount of numbers there are. there are 5 numbers so you do 355/5 to get 71.
Difference means you want to find the change between two, thus u subtract between both of it.
m-2
3/5 = 6/10 (which is 60%) 100% - 60% = 40%
