Question

Given the set: `{-3,-7,18,x,-12,-9,2}`, for what x would the mean of the set be 0?

Answer 1

`x=11`

Explanation:

`sum{-3,-7,18,x,-12,-9,2} = -11+x`

If the mean is `0` then the sum of the terms must also be `0`

`-11+x =0 rArr x=11`