Question: Normal curve and colour plot

Hi I have just begun to use Maple and there are some function I am not able to use.I have 3 questions

  1. I would like to plot the normal function (given a specific expected value and variance): is there a simple function to do it or I just have to re-write the function inside Maple?
  2. is it possible to draw a line for a specific value of the graph, let's say x=1 without drawing an entire line for the graph (just to highlight the point)
  3. is it possible to colour only an area that is below my curve, given certain value: example: I want to colour the area below the normal curve for value of x<sigma

thanks

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