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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The Illinois bobcat hunting season will last through Jan. 31. The trapping season will last from Nov. 5 through Jan. 25, with some variations depending on region, according to the department. Those who hunt bobcats outside of the designated hunting season can be charged. Claire Donnelly is a reporter for WBEZ.