# Expected value stats

This article is about the term used in probability theory and statistics. For other uses, see Expected value (disambiguation). In probability theory, the expected value of a random variable, intuitively, is the long-run. Definition of expected value & calculating by hand and in Excel. Includes video. Find an expected value for a discrete random variable. The expected value (or mean) of X, where X is a discrete random variable, is a weighted average of the possible values that X can take, each value being.
Add the two values together: To calculate the standard deviation we first must calculate the variance. In this book he considered the problem of points and presented a solution based on the same principle as the bejeweled timed of Pascal and Fermat. The math behind this kind of expected value is: The same principle applies to a continuous random variableexcept that an integral of the variable with respect to its probability density replaces the sum. Make a probability chart see:

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