An important subcomponent of a medical device produced by a manufacturing line is normally distributed with mean 70.2" and standard deviation is 1.26".
(a) What is the probability that one randomly selected unit has a length exactly 72"?
(b) What is the probability that one randomly selected unit has a length less than 72"?
(c) What is the probability that one randomly selected unit has a length greater than 72"?
(d) What is the probability that, if three units are randomly selected, none of them have
lengths exceeding 72"?