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The standard deviation and the variance are measures of the spread of values around the expected value. This is visualized in histograms. The Greek letter sigma is usually used for the standard deviation. We can calculate how high the probability is that a number deviates from the expected value by at most one standard deviation (sigma) or two standard deviations (2sigma). Do you have any questions? Write a comment! Overview of the school material: / matheonlinevideos Mr. Locher - Simply explained!