What is sigma? The term sigma has two connotations. The first one being standard deviation. The definition of standard deviation is the average distance of all data points from the mean of the data set. Did you get it? I don't understand the word you just said.

I get that I get that. I didn't understand it either. Let me put this in perspective. Let's say you're working as a pizza delivery boy. At Domino's. Your target is to deliver a pizza in 30 minutes, your performance averages at 25 minutes and the standard deviation is plus or minus three minutes.

This standard deviation value indicates that your performance is between 25 minus three that is 22 minutes and 25 plus three that Is 28 minutes on an average? This is how you can put the concept of standard deviation in practical perspective. I'm sure this example has now helped you in gaining a detailed understanding of this concept.