Question

The values 104, 137, 154, 131, and a 5th number have a mean of 130. What's the missing number?

Answer 1

`x=124`

Explanation:

Remember that the mean can be found by summing the values and dividing by the count of the values:

`"mean"="sum"/"count"`

which gives us:

`130=(104+137+154+131+x)/5`

`650=526+x`

`x=124`