Question

The arithmetic mean of the following numbers 1, 2, 2, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6 and 7, 7, 7, 7, 7, 7, 7 is ?
A) 6
B) 9
C) 7
D) 5

Answer 1

AM=1+2×2+3×3+4×4+5×5+6×6+7×7/28
Am=140/28=5