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Thread: Probability and Venn diagrams.

  1. June 1st 2010, 02:36 AM #1
    acevipa
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    Probability and Venn diagrams.

    A survey was carried out in a new development area to gain data on home-delivered newspapers. 110 homes were selected at random and the occupants asked whether they had the daily newspaper or the weekend home paper delievered. 74 received the daily paper, 58 received the weekend apper and 10 receieved no paper at all.

    Determine the probability that the last home visited in this survey received both the daily and weekend papers.
    Last edited by mr fantastic; June 1st 2010 at 05:17 AM. Reason: Re-titled.
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  2. June 1st 2010, 04:18 AM #2
    CaptainBlack
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    Quote Originally Posted by acevipa View Post
    A survey was carried out in a new development area to gain data on home-delivered newspapers. 110 homes were selected at random and the occupants asked whether they had the daily newspaper or the weekend home paper delievered. 74 received the daily paper, 58 received the weekend apper and 10 receieved no paper at all.

    Determine the probability that the last home visited in this survey received both the daily and weekend papers.
    You are required to work out how many of the 110 homes have both papers delivered, call this number N, then the required probability is N/110.

    CB
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  3. June 1st 2010, 04:58 AM #3
    acevipa
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    Quote Originally Posted by CaptainBlack View Post
    You are required to work out how many of the 110 homes have both papers delivered, call this number N, then the required probability is N/110.

    CB
    Yes but how do you work that out?
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  4. June 1st 2010, 05:18 AM #4
    mr fantastic
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    Quote Originally Posted by acevipa View Post
    Yes but how do you work that out?
    Draw a Venn diagram. Then, it should be clear that (74 - N) + N + (58 - N) = 100 ....
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