Thread: 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??

Originally Posted by Statsnoob2718

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.