Question

Please help, I'm not thank strong in means.

Answer 1

missing number is 39

Explanation:

mean is calculated as

mean =
`(sum)/(count)`

let x be the missing number

given mean = 114.8 , then

`(123+30+196+186+x)/(5)` = 114.8 ( multiply both sides by 5 to clear the fraction )

535 + x = 574 ( subtract 535 from both sides )

x = 39

the missing number is 39