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    Im stuck on this question. What would I use for the cumulative distribution function for the normal distribution?
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    (Original post by SWISH99)
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    Im stuck on this question. What would I use for the cumulative distribution function for the normal distribution?
    Is that A levels?
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    (Original post by King Arthur 284)
    Is that A levels?
    No - undergrad.

    (Original post by SWISH99)
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    Im stuck on this question. What would I use for the cumulative distribution function for the normal distribution?
    You don't need to know it explicitly. Just call it F_X(x)
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    (Original post by SWISH99)

    Im stuck on this question. What would I use for the cumulative distribution function for the normal distribution?
    \displaystyle F_X(x) = \dfrac{1}{\sqrt{2 \pi \sigma^2}} \int_{- \infty}^x \exp \left( -\frac{(t-\mu)^2}{2 \sigma^2} \right) .dt = \frac{1}{2} \left(1+\mathrm{erf} \left( \frac{x-\mu}{\sigma\sqrt{2}} \right) \right) where \mathrm{erf}(x) is the error function...

    ... if you're feeling adventurous.
 
 
 
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