A student was asked to find the arithmetic mean of the numbers 3,11,7,9,15,13,8,19,17,17,21, 14 and x. He found the mean to be What should be the number in place of x?

A student was asked to find the arithmetic mean of the numbers 3,11,7,9,15,13,8,19,17,17,21, 14 and x. He found the mean to be What should be the number in place of x?

A 3

B 7

C 17

D 31

Solution

Correct Answer: Option B