Author Question: If only the upper 30 of a normally distributed class passed a quiz for which the mean was 70 and the ... (Read 35 times)

TVarnum · **on:** Jun 20, 2018

If only the upper 30 of a normally distributed class passed a quiz for which the mean was 70 and the standard deviation was 10, what was the lowest score a student could have received and still have passed?

a. 80.0 c. 70.0
b. 64.8 d. 75.2

Question 2

On a recent paper, Maria's score, transformed to a zscore, was +1 . If the cutoff mark is the upper 10 of the class for As, the upper 10 to 20 for Bs, the upper 20 to 30 for Cs, and the upper 30 to 40 for Ds (below 60 being a failure), what grade did Maria receive on the quiz?

a. A c. C
b. B d. F