Standard Deviation Calculator. Standard deviation (σ) calculator with mean value & variance online. Population and sampled standard deviation calculator. Enter data values delimited with

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Answer: 3.4 In this case, X represents the number of classes. The possible values of X are 4 and 3, denoted x1 and x2, respectively; their proportions (probabilities) are equal to

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Whole population variance calculation. Population mean: Population variance: Sampled data variance calculation. Sample mean: Sample variance: Discrete random variable variance