probability

1) A secret admirer has been leaving you roses at the rate of 4/day. What is the probability that, on a given day, you will receive (a) exactly one rose (b) at least one rose?

2) Every student has a 1 in 9 chance of winning a certain prestigious scholarship. What is the probability that, in a group of 8 students, all of them win the scholarship? None of them wins it? At least one wins it?

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  1. 1. Read the question. It will tell you the answer. Is four exactly one? Is it one or more?

    2. All eight win: (1/9)^8 = 2.32*10^-8
    Nobody wins: (8/9)^8 = 0.3987

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    posted by drwls

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