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Math Help - Binomial Model - Normal Approximation

  1. #1
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    Binomial Model - Normal Approximation

    Hi I am stuck on the following question

    The Anderson tennis racquet comes in a midsize and an oversize version. From previous history is is known that sixty percent of all customers purchasing a new tennis racquet at a certain large sports store want the oversize version of the particular brand.

    what is the probability that more than 32 customers in a random sample of 40 will purchase the oversized tennis racquet?

    any help would be great!
    Thanks from Raadharaja
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  2. #2
    MHF Contributor matheagle's Avatar
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    Re: Binomial Model - Normal Approximation

    estimate that probability with P(N>32.5)
    where N is a normal random variable with mean np=(40)(.6) and variance npq.
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