SOLUTION: A manufacturer buys chips by box of 20. His strategy is the following: he randomly selects 4 chips per box, tests them and accepts the box if and only if they all four pass the

Question 750073: A manufacturer buys chips by box of 20. His strategy is the following: he randomly selects 4 chips per box, tests them and accepts the box if and only if they all four pass the tests. If the probability that one chip is working properly is 0,1 independantly from the others, what is the proportion of boxes that will be refused ?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A manufacturer buys chips by box of 20. His strategy is the following: he randomly selects 4 chips per box, tests them and accepts the box if and only if they all four pass the tests. If the probability that one chip is working properly is 0,1 independantly from the others, what is the proportion of boxes that will be refused ?
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Comment: Are you saying that only 10% of the chips are working?
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Cheers,
Stan H.
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