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Math Help - Binomial Distribution Help

  1. #1
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    Binomial Distribution Help

    Hey everyone,
    I somewhat know how to do this question but I can't seem to get the answer..

    Let x be a binomial random variable and suppose n= 20, p=0.4. Then P(μ-σ ≤ x ≤ μ+σ) is:
    I know that μ = np = 8
    I know that σ is sqrt(npq) = 2.19

    Therefore, μ-σ = 5.81 and μ+σ = 10.18 so the area covered by 1 standard deviation is 4.38

    So to find P(area covered by 1 standard deviation) I would use the z-score: z = x-μ/σ

    ...
    ...
    This is where i get stuck lol. any help? I know I'm almost there (i think)
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  2. #2
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    Re: Binomial Distribution Help

    nevermind, I figured this out.
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