Question

What number must be added to 3,-8, and 5 to have a mean of 2?

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Answer 1

8

Explanation:

The mean is calculated as

mean =
`(sum)/(count)`

let x be the required number , then

`(3-8+5+x)/(4)` = 2 ( multiply both sides by 2 to clear the fraction )

0 + x = 8 , so

x = 8