Probability Puzzles
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The lifetime of a color TV picture tube is normally distributed, with a mean of 8 years and a std. dev. of 2 years.
(i) What is the probability that a picture tube will last more than 10 years?
(ii) If the firm guarantees the picture tube for 4 years, what percentage of the tubes sold will have to be replaced?View SolutionSubmit Solution- 1,565.6K views
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A white rook and a black bishop of a standard chess set are randomly placed on a chessboard
What is the probability that one is attacking the other?
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- 1 votes
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Stacy has twelve black socks and twelve white socks in her drawer.
In complete darkness, and without looking, how many socks must she take from the drawer in order to be sure to get a pair that match?
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In a country,
All families wants a boy. They keep having babies till a boy is born.What is the expected ratio of boys and girls in the country?
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- 1 votes
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You’re on a game show, and you’re given the choice of three doors: Behind one door is a car; behind the others, goats. You pick a door, say No. 1, and the host, who knows what’s behind the doors, opens another door, say No. 3, which has a goat. He then says to you, “Do you want to pick door No. 2?” Is it to your advantage to switch your choice?
With you switch or stay with your door?
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- 1 votes