Question

How to do this question plz answer me ​

Answer 1

6

Explanation:

The mean is calculated as

mean =
`(sum)/(count)`

let x be the fourth number, then

`(9+14+15+x)/(4)` = 11 ( multiply both sides by 4 )

38 + x = 44 ( subtract 38 from both sides )

x = 6

The number on the fourth card is 6