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Math Help - Proportions p=f/N

  1. #1
    tm3
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    Question Proportions p=f/N

    Suppose that the number of boxes of cookies sold by girl scouts in the state of Minnesota in 2012 follows a normal distribution with mean 45 and standard deviation 25.
    What proportion of Minnesota girl scouts sold more than 50 boxes of cookies?

    Now, I get that the formula for proportion is p=f/N but I do not know what to use for N!
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  2. #2
    tm3
    tm3 is offline
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    Re: Proportions p=f/N

    Nevermind, I was supposed to use the Z score. Made the answer simple! Thanks anyways!
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