The test scores for a math exam have a mean of 72 with a
standard deviation of 8.5.
Let the random variable X represent an exam score.
a) Find the probability that an exam score is at most 80.
(decimal answer, round to 3 decimal places)
b) Find the probability that an exam score is at least 60.
(decimal answer, round to 3 decimal places)
c) Find the probability that an exam score is between 70 and 90.
(decimal answer,...