1. Let Y denote the diameter in millimeters of Styrofoam pellets used in packing. Assume that Y has a log-normal distribution with parameters µ = .8 and a = .1.
(a) Find the probability that a randomly selected pellet has a diameter that exceeds 2.7 mm.
(b) Between what two values will Y fall with probability approximately .95?
2. Verily the normal probability rule.