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Math Help - Probability Question

  1. #1
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    Probability Question

    Need some help with this.

    A survey has been undertaken to determine if there is a relationship between place of residence and type of dwelling. The table presents data from a random sample of 650 households.
    Type of Dwelling
    Place Owns Home Owns Condo Rents Apartment
    Large City 20 100 180
    Suburb 120 45 60
    Rural 95 25 5

    a.)What is the probability that the household lives in a suburb and owns a condo?
    b.)What is the probability that the household lives in a large city?
    c.)What is the probability that the household lives in a large city or rents an apartment?

    Thanks
    Last edited by mr fantastic; March 7th 2010 at 01:32 AM. Reason: Restored deleted question.
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  2. #2
    Member u2_wa's Avatar
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    Quote Originally Posted by dalollis View Post
    Need some help with this.

    A survey has been undertaken to determine if there is a relationship between place of residence and type of dwelling. The table presents data from a random sample of 650 households.
    Type of Dwelling
    Place Owns Home Owns Condo Rents Apartment
    Large City 20 100 180
    Suburb 120 45 60
    Rural 95 25 5

    a.)What is the probability that the household lives in a suburb and owns a condo?
    b.)What is the probability that the household lives in a large city?
    c.)What is the probability that the household lives in a large city or rents an apartment?

    Thanks
    Hello:
    a) prob. = \frac{45}{650}
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  3. #3
    Member u2_wa's Avatar
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    b)prob. =\frac{20+100+180}{650} =\frac{6}{13}

    c)prob. =\frac{20+100+180+60+5}{650}=\frac{73}{130}
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  4. #4
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    other questions

    d.)
    What is the probability that the household owns a home given that they live in a suburb? is it 120225= 815 ?
    e.)
    What is the probability that the household lives in a suburb or large city?
    Last edited by mr fantastic; March 7th 2010 at 01:33 AM. Reason: Restored deleted questions
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  5. #5
    Member u2_wa's Avatar
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    Quote Originally Posted by dalollis View Post
    Thanks WA!
    d) is correct

    e)prob. =\frac{200+225}{650}
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