SOLUTION: 2.A lot of 80 semiconductor chips contains 2 that are defective. Two are selected randomly, without replacement, from the lot.
a.What is the probability that the first one select
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a.What is the probability that the first one select
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Question 959351: 2.A lot of 80 semiconductor chips contains 2 that are defective. Two are selected randomly, without replacement, from the lot.
a.What is the probability that the first one selected is defective?
b.What is the probability that the second one selected is defective given that the first one is defective?
c.What is the probability that both are defective?
d.How does the answer to part (b) change if chips selected were replaced prior to the next selection? Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! 2.A lot of 80 semiconductor chips contains 2 that are defective. Two are selected randomly, without replacement, from the lot.
a.What is the probability that the first one selected is defective?
Ans: 2/80
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b.What is the probability that the second one selected is defective given that the first one is defective?
Ans: 1/79
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c.What is the probability that both are defective?
Ans: 2C2/80C2 = 1/(80*79)
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d.How does the answer to part
(b) change if chips selected were replaced prior to the next selection?
Ans: (2/80)^2 = (1/40)^2 = 1/1600
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Cheers,
Stan H.
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