Samples of a cast aluminum part are classified on the basis of surface finish (in micro inches) and edge finish. The results of 100 parts are summarized as follows:
Edge finish
Excellent good Surface Excellent 80 2
Finish Good 10 8
(a) Let A denote the event that sample has excellent surface finish, and let B denote the event that a sample excellent edge finish, Determine the number of samples in A’ ∩ B, B’, and A U B.
(b) Assume that each of two samples is to be classified on the basis of surface finish, either excellent or good