In the manufacture of gallium arsenide wafers for computer chips, defects average 10 per square centimeter. Let X be the number of defects on a given square centimeter. (a) Justify the use of the...

In the manufacture of gallium arsenide wafers for computer chips, defects average 10 per square centimeter. Let X be the number of defects on a given square centimeter. (a) Justify the use of the Poisson model. (b) What is the probability of fewer than five defects? (c) More than 15 defects? (d) Construct the probability distribution (Excel or Appendix B) and make a graph of its PDF. (Data are from Scientific American 266, no. 2 [February 1992], p. 102.)