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Kara has five exam scores of 89, 82, 69, 79, and 70 in her biology class. What score does she need on the final exam to have a mean grade of 80? Round your answer to two decimal places, if necessary. (All exams have a maximum of 100 points.

User Supra
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1 Answer

3 votes

Answer:

91

Explanation:


(89+82+69+79+70+x)/(6) = 80 Combine like terms


(389+ x)/(6) = 80 Multiple by sides by 6

380 + x = 480 Subtract 389 from both sides.

x = 91

User Notthehoff
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