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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Also, despite still being a hunting rifle, the hunting rifle in New Vegas is much better than the hunting rifle in Fallout 3. (as in, I can get one shot kills on Deathclaws with AP ammo and a sneak attack critical) â Earlz Feb 2 '11 at 17:37.+1 for Ratslayer.p vote 8 down vote accepted. Chances are you can pick up a (hunting rifle) scope at the 188 Trading Post on your way into Vegas (cheaper than Gun Runners anyway!) - according to the Fallout wikia page, there's not that many places to get one.