28 32 21 22

The mean is 24.4 what is the 5th number

The awnser has to be 26?

Set up an equation with x as the variable for the missing number

(28+32+21+22+x) / 5 = 24.4

multiply both sides by 5

28+32+21+22+x = 5 (24.4)

simplify (add and multiply)

103+x = 122

subtract 103 from both sides

x = 122-103

simplify

x = 19