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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Get your tickets today for a chance to win the annual Conservation Elk Tag. With a cost of only $25 (6 Tickets for $100), any hunter has a chance to win this once-in-a-lifetime hunt! The drawing will be held at the Elk Country Visitor Center in Benezette, PA on Sunday August 20st at 1PM during the 2017 Elk Expo. Winner of the special tag will receive a hunt featuring: