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Math Help - Probability Word Problem homework help

  1. #1
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    Probability Word Problem homework help

    A group of students was recently polled about the technology they own.

    69 own a cell phone
    45 own a computer
    23 own an ipod
    4 do not own any of the above three items
    34 own a cell phone but not a computer nor an ipod
    6 own all three, a computer, an iPod, and a cell phone
    8 own a cell phone and an ipod but not a computer
    2 own only an ipod

    a.) How many students were polled?

    b.) What is the probability a randomly selected polled student owns a computer?

    c.) What is the probability a computer owner also owns an iPod?

    d.) What is the probability a randomly selected polled student owns an iPod or a cell phone?

    e.) What is the probability a randomly selected polled student owns an ipod and a cell phone?
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  2. #2
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    Re: Probability Word Problem homework help

    A Venn diagram will be very helpful to solve this. Have you tried drawing one?
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  3. #3
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    Re: Probability Word Problem homework help

    I'll try
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    Re: Probability Word Problem homework help

    Once you do, post your answer to part a) and I will tell you if it agrees with what I got.
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  5. #5
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    Re: Probability Word Problem homework help

    i got 89 for a.)
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  6. #6
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    Re: Probability Word Problem homework help

    I got 45/89 for b.)
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    MHF Contributor MarkFL's Avatar
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    Re: Probability Word Problem homework help

    I get a different number for part a). Can you post your diagram?

    edit: Did you leave out those who do not own any of the 3?
    Last edited by MarkFL; November 20th 2012 at 02:48 AM.
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    Re: Probability Word Problem homework help

    Yes so is 93?
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    Re: Probability Word Problem homework help

    Yes, that's what I have.
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    Re: Probability Word Problem homework help

    I got 13/93 for c
    78/93 for d
    8/93 for e

    Is that what you got??
    Last edited by asilvester635; November 20th 2012 at 03:14 AM.
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  11. #11
    MHF Contributor MarkFL's Avatar
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    Re: Probability Word Problem homework help

    c) no

    d) yes, but reduce the fraction.

    e) no
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    Re: Probability Word Problem homework help

    C) 7/93
    E) How is it not 8/93? It asks us the probability that a student owns an iPod and a cell phone, and the example tells us that 8 owns a cellphone and an ipod??????
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  13. #13
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    Re: Probability Word Problem homework help

    c) No. You know there are 45 computer owners, so the denominator will be 45.

    e) You are neglecting those who own all 3.
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    Re: Probability Word Problem homework help

    Right, but there are 6 others that have all three. They qualify don't they?
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  15. #15
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    Re: Probability Word Problem homework help

    ok
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