You can calculate the mean, median, and std dev for discrete or continuous data. Each type has its own set of formulas.
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Standard deviation is a measure of how spread out a set of numbers are from each other. It has a variety of uses in statistics.
Standard deviation in statistics refers to how much deviation there is from the average or mean value. Sample deviation refers to the data that was collected from a smaller pool than the population.
Variance. However, in fact the standard deviation is calculated from the variance, not in the order that the question seems to suggest.
Usually s means standard deviation of a sample.
A standard deviation in statistics is the amount at which a large number of given values in a set might deviate from the average. A percentile deviation represents this deviation as a percentage of the range.