Question

Jake had grades of 92,90,85 and 88 on five math test . What grade must he get on the 5th test to have an average of 90 ?

Answer 1

if x is the fifth test score, the average = total score divide 5 tests, try that

Answer 2

Do you know how to fine out the average?

Answer 3

Average = Sum of observations / total no. of observations

Take the unknown grade as x and then work it out yourself! :)

Answer 4

(92+90+85+88+x)/5=90

(355+x)/5=90

355+x=450

x = 95

He must score a 95 on the next test to get an average of 90 in the class