# Given a set # {-1,2,-12,52,x} #, for what x would the mean of the set be -3?

##### 2 Answers

Nov 22, 2015

#### Explanation:

Let the count of values be n

Let the mean be z

Let the sum be s

The mean is that single value for which

So in this case the mean is -3 and n is 5. So the sum of all values is

The given 4 values are

So

Check:

Nov 22, 2015

The number

#### Explanation:

The mean of a set of numbers is the sum of the numbers divided by their quantity. So in this case it is:

According to the task the mean is