Suppose that the distribution of x = the number of items produced by an assembly line during an 8-hour shift can be approximated by a normal distribution with mean value 150 and standard deviation 10.
a. What is the approximate probability that the number of items produced is at most 120?
b. What is the approximate probability that at least 125 items are produced?
c. What is the approximate probability that between 135 and 160 (inclusive) items are produced?