Question

The mean of 4 numbers is 88.

What is the fourth number if three of the numbers are 80,95,and 85

Answer 1

The fourth number is 92

Explanation:

Let the fourth number be represented with x

Mean = Total sum of values / No of given values

Mean = 88

`88= (80+95+85+x)/(4)\\ \\88=(260+x)/(4)\\ \\Cross\:Multiply\\\\88* 4 = 260+x\\352= 260+x\\352-260=x\\92=x\\\\x=92`