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    Oct 10, 2007, 10:51 AM
    Statistics maybe binomial distribution
    Hi everyone
    I am having some trouble with the following questions. If anyone could help me out that would be great! Thanks a lot!

    Here are the questions:
    Let X represent the number of heads when a fair coin is tossed 20 times. Let Y represent the number of sixes that appear when a six-sided die is tossed 50 times. It is reasonable to assume X and Y are independent.
    #1. What is the expected value of X + Y?
    #2. What is the variance of X + Y?
    #3. What is the standard deviation of X – Y?

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