Adding a constant value, c, to each term increases the mean, or expected value, by the constant. E(X+c) = E(X)+c. Rule 3. Multiplying a random variable by a constant value, c, multiplies the expected value or mean by that constant. Rule 4. The expected value or mean of the sum of two random variables is the sum of the means. This is also known as the additive law of expectation. E(X+Y) = E(X)+E(Y) Formulas and Rules for the Variance, Covariance and Standard Deviation of Random Variables.
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These women at the Love Ranch in Carson City, Nevada, wait for customers to arrive.Marc McAndrews. Before traveling to Nevada, photographer Marc McAndrews had never been to a strip club, let alone a brothel. Now heâs been to every single one in the state. Over the course of five years, McAndrews made regular trips to Nevadaâs legal brothels, staying anywhere from a week to a month each time.