It is: 13+9+11 = 33 and 33/3 = 11 which is the mean average
Average: (13+9)/2 = 11
Average = (6+9+10+11)/4 = 36/4 = 9
the average of 7,9,11,12,16 is = (7+9+11+12+16)/5 =11
The average is 10... 11+11+9+7+12=50... 50/5=10
The average is 13.
7 + 9 + 11 = 27. Divide by 3. = 9.
Average = (9+13)/2 = 22/2 = 11
The average of 6, 9, 10 and 11 is 9.
10
10
11