FIXED Standard Normal Distribution Model (With Mean and Standard Deviation lines)

Note: Print settings were 3 perimeters, zero infill and zero top/bottom layers.

I had some problems getting the original file to slice. Also I cropped it down a bit and scaled it to 50% for fitting two problems side by side on engineering paper (still a bit large but it is nice to work with).

From the original creator:

"This is the standard normal distribution as it is defined from -3 to +3 standard deviations. The standard normal distribution is an essential tools in statistics. This