2. The sample mean and sample standard deviation on your economics examination were 80 and 10,

respectively; the sample mean and sample standard deviation on your statistics examination were 40 and

15, respectively. You scored 90 on the economics exam and 72 on the statistics exàm. Assuming that the

two histograms of test scores are approximately normal histograms,

a. on which exam was your percentile score highest?

b. approximate the percentage of the scores on the economics exam that were below your score.

c. approximate the percentage of the scores on the statistics exam that were below your score.