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Math Help - Binomial distribution.

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    Binomial distribution.

    XYZ has calculated the probability that a customer who comes into the store and buys something is 0.20. Inthe course of a certain day 50 customers visit the store. Calculate the probability that 10 or fewer customers make a purchase on this particular day.

    More important for me is result than the formula.
    Last edited by mr fantastic; May 30th 2010 at 05:14 AM. Reason: Re-titled.
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    Quote Originally Posted by Suchy View Post
    XYZ has calculated the probability that a customer who comes into the store and buys something is 0.20. Inthe course of a certain day 50 customers visit the store. Calculate the probability that 10 or fewer customers make a purchase on this particular day.

    More important for me is result than the formula.
    X ~ Binomial(n = 50, p = 0.20).

    Calculate \Pr(X \leq 10).
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