Sam wants to get at least an 80% average in his class. He knows that his teacher plans to give five test this marking period. His current test grades are 85,81,75,67. What Grade does Sam need to exactly get an 80% average?

Question

Mathematics

Lillian Wong

2 March, 23:01

Sam wants to get at least an 80% average in his class. He knows that his teacher plans to give five test this marking period. His current test grades are 85,81,75,67. What Grade does Sam need to exactly get an 80% average?

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Answers (2)

Know the Answer?

Flint · Answer 1

Same would need to get at least a 95% on the next test, if he would like to receive a total average of an 80%

Cristina Odom · Answer 2

We are given his four test scores out of the five tests he will receive, so all we need to do is solve for the last test score. We can do this by setting up an equation where (85 + 81 + 75 + 67 + x) / 5 = 80. In this equation, x represents Sam's last test score that he will have to make in order to achieve an 80 percent average in his class. Now all we have left to do is solve for x.

(85 + 81 + 75 + 67 + x) / 5 = 80

(308 + x) 5 = 80

308 + x = 400

x = 92

Final Answer: Sam must achieve 92 percent on his next test to achieve an average of exactly 80 percent.