Normal Distribution with Halfway Markers

This is the normal distribution, made with three channeled lines; one to mark the mean, and two to mark what is approximately half way out (s=1.5) on it. This does not mean that 50% of the data would fall between these two lines (quite a bit more, actually; about 86%).

This is meant to operate as a physical model for assisting the visually impaired with understanding common statistical problems, such as any queston that asks for what percentage falls between two given z scores. The being able