The thickness of glass sheets produced by a certain process is usually distributed with a mean of 3 mm and a standard deviation of 0.12 mm.
(a) Compute the probability that a glass sheet is thicker than 3.2 mm?
(b) Compute the probability that a glass sheet is thinner than 2.7 mm?
(c) Compute the value of c for which there is a 99% probability that a glass sheet has a thickness within the interval [3 - c, 3 + c]?