The normal distribution formula is based on two simple parameters—mean and standard deviation—that quantify the characteristics of a given dataset.

How to Interpret the Mean & Standard Deviation on a Control Chart. The extent to which products meet specifications needs to be systematically monitored in a production process.

In a normal distribution, 68% of values are within 1 standard deviation of the mean, 95% of values are within 2 standard deviations of the mean and 99.7% of values are within 3 standard deviations ...