Question: point of inflection

I would like to find the turning point in a normal distribution. And mark these points with a sigma. Maple with the command:
> restart;
with(Statistics):
N := RandomVariable(Normal(6.80, 1.47)):
Student[Calculus1]:-InflectionPoints(PDF(N, x), 1 .. 12.5)
no solution.
Student[Calculus1]:-FunctionChart(PDF(N, x), 1 .. 12.5)
and this shows me the chart.
I would like to find these points, the numerical value. And make a graph similar to the command
Student[Calculus1]:-FunctionChart(PDF(N, x), 1 .. 12.5)
Herclau
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