Photo by Alex Knight on Unsplash Introduction The Normal Distribution was first discovered by Abraham de Moivre in 1733. Due to historical error it was credited to Carl Friedrich Guass , who made first reference to the Normal Distribution in 1809 as the distribution of errors in Astronomy. Since then the distribution was widely used in various fields and is in continuous development. The Normal Distribution is the most important continuous probability distribution and plays a very important role in various statistical analysis. It fits the most of naturally occurring variables like Population Age, Height, Weight, Blood Pressure, IQ Scores etc. All these follow Normal Distribution when we have significantly large samples. Definition A Continuous Variable "X" is said to follow Normal Distribution with parame...