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Math Help - probability about american households math problem

  1. #1
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    Exclamation probability about american households math problem

    9/10 households in America have a car. Let X denote the number among 4 randomly selected households that have a car.

    A. Calculate P(X=2)

    B. Calculate P(X>=2)

    C. Calculate P(X<2)

    I am unsure of what each point is exactly asking. I know that P stands for probability. Could someone put the inequalities into words for me so that I understand this further?
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  2. #2
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    A) is asking the probability X is exactly 2 and only 2.
    B) is asking for the probability X is greater than or equal to 2, ie. X=2, 3 or 4.
    C) is asking for the probability X is less than (but NOT including) 2, ie. X=0 or 1.

    Use binomial distribution to find the probabilities.
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  3. #3
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    A. = 0.0486

    B. = 0.9963

    C. = 0.0037

    is this correct. i think i understand. thank you. very helpful
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  4. #4
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    Yes - some quick use of my graphics calculator gives the same answers you have found.
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