Jenny’s test grades are 93, 89, 96, and 98. If she wishes to raise her average to 95, what does she need to score on her next test?

Question

i found the average of the 4 numbers to be 94, how would i know that a 99 would bring her average to a 95?

Answer 1

the underlying formula that you want to use to solve this one is

(93 + 89 + 96 + 98 + x) / 5 = 95

solving that for the value of "x" algebraically yields

376 + x = 475

x = 99

meaning that she needs to score a 99 on the next exam

Answer 2

You would have to do an equation, which would be: [(93+89+96+98)+x]/5 = 95

Hope that helps!