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. If5cardsaredefective, what is the probability that at least 1 defective card appears in the sample?
c. Calculate mean and variance of the number of defectives in the sample when 5 cards are defective.
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