Last year I made a couple of models on Desmos to demonstrate aspects of the normal distribution to my statistics students.
In this first one, you can set a normal distribution with any mean and standard deviation and then show what happens when you subtract μ and divide by σ to standardise the distribution (to do this, simply move the sliders). It’s great because students can now visualise the procedure they are carrying out.
2. Area Under the Normal Distribution Curve
In this one you move the sliders for ‘a’ and ‘b’ to demonstrate P(Z<a) or P(Z>b). You can hide/reveal shading for the area in question, the remaining area and any equivalent area reflected in the y-axis as and where appropriate. To hide/reveal areas, click on the circles on rows 7, 9, 10, 15, 17 or 19.
Have a play and use them how you see fit.
The World Is Maths 
[…] But you don’t need to know the CDF to represent it in Desmos, you just need to use inequalities to shade the region between the x-axis and the curve, with a slider for the variable value of x. The syntax is a little unusual, but take a look and you’ll see how it’s done. The same principle was used in my model for normal distribution. […]
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