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Quiz_Chpt4-1_Q - CHAPTER 4 1 For a constant c and a random...

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C HAPTER 4 1. For a constant c and a random variable X , what is the mean of X + c ? (a) c (b) E[ X ]+ c (c) E[ X ] (d) c E[ X ] 2. For two independent random variables X and Y , what is the mean of X + Y ? (a) 0 (b) E[ X ]+E[ Y ] (c) E[ X ]E[ Y ] (d) None of the above. 3. For two correlated random variables X and Y , what is the mean of X + Y ? (c) E[ X ]E[ Y ] (d) None of the above. 4. For two independent random variables X and Y , what is the variance of X + Y ? 5. For two correlated random variables X and Y , what is the variance of X + Y ? 6. The total area under the pdf curve is (a) 1 (b) 0 (c) depends on the nature of the pdf (d) none of the above 7. The spectral density of white noise
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