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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Concealed Weapons Permits of 15 States to Be Accepted in Nevada. The Nevada Sheriffsâ and Chiefsâ Association members agreed at a meeting last month to recognize the carry concealed weapon permits of 15 states as being valid in Nevada beginning July 1. The states agreed to at the May 5 meeting are: Alaska, Arizona, Arkansas, Kansas, Kentucky, Louisiana, Michigan, Missouri, Nebraska, New Mexico, North Carolina, Ohio, Rhode Island, Tennessee and West Virginia, according to a news release submitted by Carson City Sheriff Ken Furlong.