Question

Find the value of x such that the data set has a mean of 103.

99,122,103,113,109,x

Answer 1

That means the average of all data point equal:

(99+122+103+113+109+x)/6 = 103
===> (546+x)/6 = 103===> 546+x=618 & x=618-546=72, so x =72