2. Risa and Lylah, who are in different Biology classes, were given the same exam. The exam results are in the
table below.
Risa's Class
Lylah's Class
Mean Grade
76
Standard Deviation
85
8
5
If Risa scored an 87 on her exam and Lylah scored a 91 on her exam, which student performed better relative to
their class? Show the necessary calculations and write a sentence (or two) that justifies your answer.
(10 pts)
3. Assume that blood pressure readings are normally distributed with a mean of 125 and a standard deviation of
9.6. Suppose 144 people are randomly selected. Find the probability that their sample mean blood pressure will
be less than 127. (please include a labeled sketch of the normal curve)
(10 pts)