(Solved): 2. Samples of a cast aluminum part are classified on the basis of surface finish (in microinches) ...

2. Samples of a cast aluminum part are classified on the basis of surface finish (in microinches) and edge finish. The results of 100 parts are summarized as follows: Let \( A \) denote the event that a sample has excellent surface finish, and let \( B \) denote the event that a sample has excellent edge finish. A part is selected at random. (a) Find \( P\left(A \cup B^{\prime}\right) \) (d) If the selected part has excellent surface finish, what is the probability that the Edge finish is excellent?