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Math Help - bell curve

  1. #1
    MHF Contributor Quick's Avatar
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    bell curve

    small question, is there an equation that'll give you a graph like a bell curve?
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  2. #2
    Eater of Worlds
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    Yes, there is:

    The one used to calculate the standard normal table is:

    \frac{1}{\sqrt{2\pi}}\int_{-\infty}^{z}{e^{\frac{-x^{2}}{2}}}dx

    For instance, if you have a stats book with the table to compare for fun.

    Try integrating the above with z=-1.645. You should get very close to 0.05.

    Actually, it's 0.0499849....
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  3. #3
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    Quote Originally Posted by Quick View Post
    small question, is there an equation that'll give you a graph like a bell curve?
    Are you interested to know why there is a factor of 2\pi there?
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  4. #4
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    Quote Originally Posted by ThePerfectHacker View Post
    Are you interested to know why there is a factor of 2\pi there?
    No, I just wanted to see how to mess with the curve
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  5. #5
    Grand Panjandrum
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    Quote Originally Posted by Quick View Post
    small question, is there an equation that'll give you a graph like a bell curve?
    Normal density:

    <br />
f(x)=\frac{1}{\sqrt{2 \pi} \sigma} e^{-\frac{(x-\mu)^2}{2 \sigma^2}}<br />

    RonL
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