need perfect answer with correct explanation

A manufacturing process has 45 customer orders to ll' Each order requires one component part that is purchased from a supplier. However: typically 4% of the components are identied as defective: and the components can be assumed to be independent. (a) If the manufacturer stocks 4'! components, when is the probability that the 45 orders can be lled without reordering components? (b) Let X be the number of good (i.e., non'defective) components among the 47 in stock. Find the mean of X. (C) Find the variance of X [from pan (1')]