MA 110-91
§4.4 – 4.5 Quiz #7 score
Name:
4 November 2000
1. Prefessor Lou Zer is teaching a very popular course in advanced celestial mechanics with
250 students. The scores on the first test have a mean of 78 and a standard deviation of
9. If Professor Zer wants to have 50 students earn an A on the first test, what should the
cut-off score be for a A? (7 points)
2. How many individuals would need to be questioned in a survey if we want to have a level
of confidence of 95% with a possible margin of error of 3%? Suppose we need a MOE of 2%
with confidence level 95% – how many individuals are needed in the sample? (10 points)
