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Math Help - Need help with expected value and variance

  1. #1
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    Need help with expected value and variance

    Hey, I am having trouble with a problem. How do you find the E(Y) and Var(Y) for the equation Y=0.8X - 3 with the information of E(x) = 10 and Var(x) = 5. If anyone could give me any hints at how to do this would be greatly appreciated. Thanks.
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  2. #2
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    Quote Originally Posted by Micknrc View Post
    Hey, I am having trouble with a problem. How do you find the E(Y) and Var(Y) for the equation Y=0.8X - 3 with the information of E(x) = 10 and Var(x) = 5. If anyone could give me any hints at how to do this would be greatly appreciated. Thanks.
    You're expected to know that E(aX + b) = aE(X) + b and Var(aX + b) = a^2 Var(X).
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