Question

The mean of five numbers is 8.2. Four of the numbers are 8, 10, 12 and 10.

Work out the fifth number.

Answer 1

1

Explanation:

the mean is calculated as

mean =
`(sum)/(count)`

let x be the fifth number , then

`(8+10+12+10+x)/(5)` = 8.2 ( multiply both sides by 5 to clear the fraction )

40 + x = 41 ( subtract 40 from both sides )

x = 1

the fifth number is 1