There are 5% defective items in a large bulk of items.What is the probability that a sample of 10 items will include not more than one defective item?

Lot of 100 items contains 10 defective items.Five itwms are selected at random from the lot and sent to the retail store.What is the probability that the store will receive at most one defective item?

A large chain retailer purchases certain kind of electric device from manufacturer.The manufacturer indicates that the defective rate of the device is 3%.The inspector of the retailer picks 20 items from a shipment.What is the probability that the store will receive atmost one defective item?

It is know that 10% of certain articles manufactured are defective.What is the probability that in a random sample of 12 such articles,9 are defective?