A shipment of electronic parts are sampled by testing items

A shipment of electronic parts are sampled by testing items sequentially until the first defective part is found.If 10 or more parts are tested until the first defective is found, the shipment is accepted as meeting specifications.(show details please)

1)Determine the probability that the shipment will be accpeted if it contains 10% defective parts.

2)How many need to be sampled if it is desired that a shipment with 25% defective parts be rejected with probability of at least 0.75? That is ,if n or more parts are tested in oreder for the first defective part to be found, the shipment is accepted as meeting specifications. Find the smallest n that rejects with a probability of at least 0.75, a shipment with 25% defective parts.

Solution