Question

The average of four numbers 30.5. three of the numbers are 24.2, 14.5, 50.5

what is the fourth number?

Answer 1

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Answer 2

32.8

Explanation:

The average is calculated as

average =
`(sum)/(count)`

let x be the fourth number, then

`(24.2+14.5+50.5+x)/(4)` = 30.5 ( multiply both sides by 4 )

89.2 + x = 122 ( subtract 89.2 from both sides )

x = 32.8

Thus the fourth number is 32.8