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Math Help - binomial distribution.

  1. #1
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    binomial distribution.

    a)You take a random sample of 10 mirrors and find 1 broken mirror. What is the probability of finding 1 or more broken mirrors out of a sample of 10 if the probability of receiving a broken mirror is 0.01

    b)You take a random sample of 2000 mirrors and find 30 broken mirror. What is the probability of finding 30 or more broken mirrors out of a sample of 2000 if the probability of receiving a broken mirror is 0.01
    Last edited by mr fantastic; October 15th 2010 at 08:51 PM. Reason: Edited title.
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  2. #2
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    Question a
    P( no broken mirrors ) = 0.99^10
    P(at least one)=1-P(none)
    =1-0.99^10

    Question b
    you can use the Central Limit Theorem to solve this question.
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