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Math Help - Finding probability

  1. #1
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    Aug 2011
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    Finding probability

    Hi. So I have to work these out:

    1. What is the probability of achieving a finishing position in the top 3 when starting from one
    of the first 6 grid positions?
    2. What is the probabilty of not finishing the race when starting from one of the first 6 grid
    positions?

    So, the questions are about a bunch of data I have collected, about six formula 1 races. For each race held in China between 2005 and 2010, I've collected data like - finishing positions, grid positions, Average speed, fastest lap, etc...

    Now, how do I answer these questions? We were told to treat all the 5 races as one lump of data, and that has confused me, as each race has a different number of drivers(e.g. 2005 has 20 drivers, 2006 has 22).

    So if I treat it as one lump, I get the following:

    For question 1:
    Overall, 128 drivers compete over the 6 year period.
    36 of those drivers started in the top 6 grid positions..
    Out of the 36 who started in the top 6, 17 of them finished in the top 3.

    For question 2:
    Out of all 128 drivers, 99 completed the race.
    Therfore, 29 drivers didn't.
    7 of those 29 drivers who didn't finish started in the top 6.

    So, can somebody help me out? Much appreciated.
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  2. #2
    MHF Contributor Unknown008's Avatar
    Joined
    May 2010
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    Mauritius
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    1,260

    Re: Finding probability

    From what I understand, your denominator is the number of drivers starting in the top 6 and the numerator is the number who got in the top 3.

    Second is just the opposite of that (or 1 - answer to 1).

    That's just my 2 cents .
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