Question

Given the set: `{1,3,x,-2,-9,12}`, for what x would the mean of the set be 0?

Answer 1

The value of `x` is `(-5)`.

Explanation:

The mean `bar(x)` is the sum of all numbers divided by their quantity. If the mean is to be equal to zero, then the sum should also be zero. So we are looking for the solution of equation:

`1+3+x-2-9+12=0`

`5+x=0`

`x=-5`