Mean is the average of all the numbers added together, then divided by the total amount of numbers. So 11+9+2+9+6+17 = 54 and there are 6 numbers so you divide 54 by 6 = 9
You have to first add up all the number's (54) then divide the number you get by the number of numbers there are in the set (6). Therefore you would get an answer of 9.
