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Math Help - Points of inflection on the graph of this distribution?

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    Exclamation Points of inflection on the graph of this distribution?

    Let X be N ( mu, sigma ^2 )

    Show that the points of inflection of the graph of the p.d.f. of X occur at x = mu +/- sigma.

    Do I have to find the first derivative or something to check for points of inflection??
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    Quote Originally Posted by Statsnoob2718 View Post
    Let X be N ( mu, sigma ^2 )

    Show that the points of inflection of the graph of the p.d.f. of X occur at x = mu +/- sigma.

    Do I have to find the first derivative or something to check for points of inflection??
    You need to find the values of x where the first derivative has a turning point. To do this, you will need to find when the second derivative is equal to zero.
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