Izzy had an 82 and an 88 on his first two tests and believed that he did well enough on his final exam to keep his B average. However, when he got his grade he received a D. He checked with his instructor and learned that the instructor had made a mistake by transposing the digits when he recorded the final exam grade. If Izzy's incorrect average (mean) for the class was 69 , what was his correct final exam score?

Question

Mathematics

Raul Gibbs

5 December, 22:25

Izzy had an 82 and an 88 on his first two tests and believed that he did well enough on his final exam to keep his B average. However, when he got his grade he received a D. He checked with his instructor and learned that the instructor had made a mistake by transposing the digits when he recorded the final exam grade. If Izzy's incorrect average (mean) for the class was 69 , what was his correct final exam score?

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Answers (1)

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Valencia · Answer 1

73

Step-by-step explanation:

to find the mean you need to add up all grades and divide if by the number of terms you added

(82 + 88 + x) : 3 = 69 (since we don't know the third grade let's call it x)

170 + x = 69 * 3

x = 37

if the digits transposed the the actual grade would be 73