154.4545455
0.03
(5+12+13)/3 = 10 is the average
13 ((12 + 14)/2) = 13
add 5 + 13 + 12 and divide by 3
The average = (18 + 12 + 13 + 17) ÷ 4 = 60 ÷ 4 = 15
The average of 12 and 13 = (12 + 3)/2 = 15/2 = 7.5
13
The average is 12.
The average is 15.
The average is 13.
Answer: 11, 12, 13 or -13, -12, -11Details:Assume the numbers are: n-1, n, n+1 ...... (1)then, (n-1)2 + n2 + (n+1)2 = 4343n2 + 2 = 4343n2 = 432n2 = 144n = 12 or -12substitute in eq 1the answer is:11, 12, 13or-13, -12, - 11
13.3