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    Calculate the Expectation and Variance

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    Let X be a random variable with the following probability distribution.

    Value x of X P(X = x)
    0 0.5
    10 0.55
    20 0.05
    30 0.10
    40 0.10
    50 0.15

    Find the expectation E(X) and the variance var(x) of X.

    1. E(X) =
    2. Var(X) =

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    Solution Summary

    In the following question, mean and variance are calculated for a probability distribution where the values and their associated probabilities are provided. This solution includes two brief calculations.