12. Add them all up and divide by the number of numbers (3)
The average is (11+11+13+17)/4 = 52/4 = 13
35
The average is 19.
(11 + 17)/(7 + 8)
Average = 13
9/11 + 8/11 = 9+8/11 = 17/11 = 16/11
The average is 16.
17-9=8 (not 18) 8-7=11 is the answer.
avg=11 (11+14+8)/3
They are 2+3+5+7+11+13+17 = 58 and 58/7 = 8 and 2/7 which is the average
(8+11+6+12+8) ÷ 5 = 45 ÷ 5 = 9and that's you average ...
-20, -17, -12, -11, 6, 7, 8, 10, 11, 16, 17, 18, 20