Question: A stationery store has decided to accept a large shipment of ball-point pens if an inspection of 20 randomly selected pens yields no more than

A stationery store has decided to accept a large shipment of ball-point pens if an inspection of 20 randomly selected pens yields no more than two defective pens.
(a) Find the probability that this shipment is accepted if 5% of the total shipment is defective.
(b) Find the probability that this shipment is not accepted if 15% of the total shipment is defective.

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