
For any distribution, the mean, denoted, is the expected value of X. The variance,, is the expected value of the square of MathApps/ProbabilityAndStatistics. It depends on the statistical distribution for these numbers (see, for example, the Wikipedia article). Do you know what your distribution is? EDIT: Suppose your. statistics the expected value (or mathematical expectation, or mean) of [ ] You can calculate and store an expectation value for multiple promotions, [ ].
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