The mean is 37,because you add up all of the numbers together to get 258,then you divide by how many there are,which in this case there are 7, so you take 258 divide by 7 to get 37 which is the rounded answer, the normal answer was 36.8... (To check your answer put the numbers in order 27,30,30,33,35,51,52 and if the number is somewhere in between 27 and 52 then you did it right)
