If X is a random variable with possible outcomes 0, 0 and -2, with P( X = 0) = 0.1 and P( X = 0 ) = 0.1, then var(X) is
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Solution 1
The variance of a random variable is a measure of how much the values of the variable vary around the expected value. It is calculated as the sum of the squared differences between each possible outcome and the expected value, each multiplied by their respective probabilities.
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