Lab 2: Probability and Random Variables - Open Michigan
The expected value does not have to be a possible value of the r.v. --- itβs an average value. Variance of a Discrete Random Variable. The variance 2 is the expected value of the squared deviations from the mean ; that is, 2 = E[(X β )2]. 2 = (x β )2 P(x) Shortcut formula: 2 = [ x2 P(x)] β 2. where represents a summation over all values ... ................
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