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There are 5 competitors in a race (John, mary and...

This topic has 2 expert replies and 0 member replies

There are 5 competitors in a race (John, mary and...

Post Thu Nov 09, 2017 12:07 pm
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    There are 5 competiros in a race (John, Mary and 3 other ones) in which there are no ties, what is the probability that Mary finish ahead of John?

    A) 1/6
    B) 1/3
    C) 1/2
    D) 2/3
    E) 5/6

    The OA is C.

    Please, can any expert assist me with this PS question? I don't have it clear and I appreciate if any explain it for me. Thanks.

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    Post Thu Nov 09, 2017 1:32 pm
    AAPL wrote:
    There are 5 competiros in a race (John, Mary and 3 other ones) in which there are no ties, what is the probability that Mary finish ahead of John?

    A) 1/6
    B) 1/3
    C) 1/2
    D) 2/3
    E) 5/6

    The OA is C.

    Please, can any expert assist me with this PS question? I don't have it clear and I appreciate if any explain it for me. Thanks.
    Well, if we assume that the outcomes are all random, then there are only 2 possibilities: Mary finishes ahead of John or John finishes ahead of Mary, so there's a 1/2 chance that Mary finishes ahead of John. (Of course, if one of them is actually faster than the other, well that would create a bit of uncertainty.)

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    Post Thu Nov 09, 2017 7:07 pm
    DavidG@VeritasPrep wrote:
    (Of course, if one of them is actually faster than the other, well that would create a bit of uncertainty.)
    No uncertainty here: if I'm getting even odds, give me the faster runner for the max. Cool

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