Question

# Self-Check A student scores 82,96,91, and 92 on four college algebra exams.What score is needed on a fifth exam for the student to earn an average grade of 90?

Upper level algebra
Self-Check A student scores 82,96,91, and 92 on four college algebra exams.What score is needed on a fifth exam for the student to earn an average grade of 90?

2021-02-26
Given:
The scores on the four college algebra exams are 82, 96, 91 and 92.
Approach:
Let’s assume that a student needs to score xon the fifth exam.
We will use the following formula for calculating average.
Average=Sum of scores/Number of exams
Calculation:
Average = Sum of scores/Number of exams
$$90=\frac{82+96+91+92+x}{5}$$
$$90=\frac{361+x}{5}$$
$$90\times 5=361=x$$
$$450=361+x$$
x=450-361
x=89
Final Statement
A student needs to score 89 on the fifth college exam.