Question

Given the set: `{1,1,1,-5,x}`, for what x would the mean of the set be 1?

Answer 1

`x=7`

Explanation:

By definition, the mean or average of a set of n data points is given by

`bar x =1/nsum_(I=1)^n x_i`

Therefore in this particular case we get :

`1=1/5(1+1+1-5+x)`

`therefore x=7`