The empirical rule is also known as the 3 sigma rule. In addition, this rule helps you analyse the market and will tell you where the probabilities are high to enter and exit the market for maximum profits. What is an empirical rule? … In standard deviation, we already understood that it is the % deviation +/- from the average of the data set that we took. When it comes to this rule, it talks about it further, and it tells what if there is a 2 times SD and a 3 times SD. You can see a pendulam in …