Question

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?

Answer 1

Answer:

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