The diameter of the dot produced by a printer is normally distributed with a mean diameter of 0.002 inch.
(a) Suppose that the specifications require the dot diameter to be between 0.0014 and 0.0026 inches. If the probability that a dot meets specifications needs to be 0.95, the standard deviation needs to be Blank 1.
(b) Assume that the standard deviation of the size of a dot is 0.0004 inch. Assume that the specifications are to be chosen symmetrically around the mean of 0.002. If the probability that a dot meets specifications is to be 0.96, specifications need to be Blank 2 for the lower bound and Blank 3 for the upper bound.