# Probability of defective circuit card in the sample

Printed circuit cards are placed in a functional test after being populated with semiconductor chips. A lot contains 140 cards, and 20 are selected without replacement for functional testing.

a.) If 20 cards are defective, what is the probability that at least 1 defective card is in the sample?

b.) If 5 cards are defective, what is the probability that at least 1 defective card appears in the sample?

#### Solution Summary

The solution shows how to calculate the probability of defective circuit card in the sample.