Standard Deviation: A 5 Step Process Calculate the mean. Find mean of square differences (variance) Take square root of the deviance. Source: The Math Dude

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Here you'll learn how to represent the standard deviation of a normal distribution on a bell curve. Then you'll use the Empirical Rule to solve normal distribution problems.

The Empirical Rule When a population has a histogram that is approximately bell-shaped, then Approximately 68% of the data will be within one standard deviation of the mean. In other words, approximately 68% of the data will be between µ − σ and µ + σ. Approximately 95% of the data will be within two standard deviations of the mean. In other words, approximately 95% of the data will be between µ − 2σ and µ + 2σ....William Navidi, Barry Monk Elementary STATISTICS Second Edition