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Math Help - Probability problem 3

  1. #1
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    Unhappy Probability problem 3

    5.27 An industry representative claims that 50 percent of all satellite dish owners subscribe to at least one premium movie channel. In an attempt to justify this claim, the representative will poll a randomly selected sample of dish owners.
    a. Suppose that the representative's claim is true, and suppose that a sample of four dish
    owners is randomly selected. Assuming independence, use an appropriate formula to
    compute
    (1) The probability that none of the dish owners in the sample subscribes to at least one
    premium movie channel.
    (2) The probability that more than two dish owners in the sample subscribe to at least one premium movie channel.
    b. Suppose that the representative's claim is true, and suppose that a sample of 20 dish
    owners is randomly selected. Assuming independence, what is the probability that
    (1) Nine or fewer dish owners in the sample subscribe to at least one premium movie
    channel?
    (2) More than 11 dish owners in the sample subscribe to at least one premium movie
    channel?
    (3) Fewer than five dish owners in the sample subscribe to at least one premium movie
    channel?
    c. Suppose that, when we survey 20 randomly selected dish owners, we find that 4 of the
    dish owners actually subscribe to at least one premium movie channel. Using a probability you found in this exercise as the basis for your answer, do you believe the industry representative's claim?
    Explain.
    Last edited by mr fantastic; March 10th 2009 at 12:51 AM. Reason: Spreading questions over several threads
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    it seems obvious to me that these problems will affect your grade in a class somehow. in which case we cannot offer you any specific help, but only (maybe) very general guidelines. in what capacity are you allowed to receive help for these? show what you have attempted for these problems
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