What is arithmetic mean of the numbers: 2, 0, 5, 4, 9, 10, and 12?

(A) 5
(B) 6
(C) 7
(D) 8

The answer is: (B) 6
Solution

A.M=\frac{2+0+5+4+9+10+12}{7}

A.M=\frac{42}{7}=6