Cerebral blood circulation (CBF), in the brains of healthy people, is normally distributed with a mean of 74 and a standard deviation of 16. (use 3 decimal places)

a) If a person has a CBF reading below 40, they are classified as at risk of having a stroke. What proportion of people will have a reading less than 40?

b) What is the 96th percentile value for Cerebral Blood Circulation (CBF)?

c) In a group of 5 students, what is the probability that at least 4 of them have obtained readings between 62 and 82?

d) For a group of 10 students, what is the expected value of students with readings between 62 and 82?