SOLUTION: goin into final exam, which will count as two-thirds of the final grade, Mike has test scores of 86, 80, 84, and 90. What score does Mike need on the final in order to earn a B, wh

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Question 209752This question is from textbook sullivan
: goin into final exam, which will count as two-thirds of the final grade, Mike has test scores of 86, 80, 84, and 90. What score does Mike need on the final in order to earn a B, which requires an average score of 80? What does he need to earn an A? This question is from textbook sullivan

Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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going into final exam, which will count as two-thirds of the final grade,
Mike has test scores of 86, 80, 84, and 90.
What score does Mike need on the final in order to earn a B, which requires an average score of 80?
What does he need to earn an A?
:
Find the average of his test scores:
%2886%2B80%2B84%2B90%29%2F4 = 85
:
Let x = final exam score which counts 2%2F3 (Test count 1%2F3)
:
%282x+%2B+85%29%2F3 = 80
2x + 85 = 3(80)
:
2x + 85 = 240
:
2x = 240 - 85
x = 155%2F2
x = 77.5 to have a B
;
"What does he need to earn an A?"
%282x+%2B+85%29%2F3 = 90
2x + 85 = 3(90)
:
2x + 85 = 270
:
2x = 270 - 85
x = 185%2F2
x = 92.5 to have an A