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

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

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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:
= 85
:
Let x = final exam score which counts (Test count )
:
= 80
2x + 85 = 3(80)
:
2x + 85 = 240
:
2x = 240 - 85
x =
x = 77.5 to have a B
;
"What does he need to earn an A?"
= 90
2x + 85 = 3(90)
:
2x + 85 = 270
:
2x = 270 - 85
x =
x = 92.5 to have an A
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