You would list the numbers in order; 17, 18, 24, 27, 31, 39, 42, 47, 55, 65. Then find the number in the middle of the set, which would be 31 and 39. Then find the mean of those two numbers so 31+39= 70 then divide that by two. So 70/2= 35
So your answer should be 35
