add 5 + 13 + 12 and divide by 3
The average is 12.
The average height for a 12 year old would be 5"6-5'8 because I was this height when I turned 12. The average height for a 13 year old would be 5"10-5"13
The average mean is: (11+12+13+14+15)/5 = 13
5"7 i guess i am 12 and 5"4
13 + (-12) + (-5) = 13 - 12 - 5 = -4
12 - 13 cm (4 - 5 inches)
13 + -12 - 5 = -4 13 + -12 = 1 - 5 = -4
13 ((12 + 14)/2) = 13
(5/6) / (13/12) = (5/6) x (12/13) = (5/1) x (2/13) = 10/13
13 - 12 + 5 = 6
13 + (-12) - 5 = -4