Standard Deviation Equation Probability. Then work out the mean of those squared differences. Displaystyle sigma sqrt 4 2.
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Displaystyle sigma sqrt 4 2. The standard deviation of x is the square root of this sum. Then for each number.
σ sqrt x μ 2 p x nonumber.
S x u 2 p x s x u 2 p x fill in the known values. Mathematically it is represented as ơ xi x 2 p xi. Displaystyle sigma sqrt 4 2. Subtract the mean and square the result.