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  • Herbie SmithDr Herbie Horses for courses

    Sven Groot said:
    Dr Herbie said:
    *snip*
    It depends on how you interpret the question.

    If you interpret the question as: my first child is a girl. Now my wife is pregnant, what are the odds of the other one being a boy? Then it's 50%.

    However, if you interpret it as: we already have two children, one of whom is a girl. How likely is it that the other is a boy? Then we must consider the following: the likelyhood of having two boys is 50% * 50% = 25%. The likelyhood of having two girls is also 50% * 50% = 25%. The likelyhood of having a boy and a girl is 50% * 50% + 50% * 50% = 50%.
    With the added information that one child is a girl, we know that two boys are impossible. We are therefore left with either boy and girl at 66% or two girls at 33%. So in 66% of the remaining scenarios, the second child is a boy.

    The disagreement people are having is one of semantics, not maths.
    Sven Groot said:
    With the added information that one child is a girl, we know that two boys are impossible. We are therefore left with either boy and girl at 66% or two girls at 33%. So in 66% of the remaining scenarios, the second child is a boy.


    Ooh, nice one!
    I get it now; I think my biology was getting in the way of the logic.  Good thing my PhD wasn't in maths.

    Herbie


  • BassBass Knows the way the wind is flowing.

    Dr Herbie said:
    Sven Groot said:
    *snip*


    Ooh, nice one!
    I get it now; I think my biology was getting in the way of the logic.  Good thing my PhD wasn't in maths.

    Herbie


    Was your Ph.D. in awesomeness? Because you are awesome. Don't assume sarcasm! This a random complement.

  • Herbie SmithDr Herbie Horses for courses

    Bass said:
    Dr Herbie said:
    *snip*
    Was your Ph.D. in awesomeness? Because you are awesome. Don't assume sarcasm! This a random complement.
    Thank you for your compliment, I shall keep it in a jar on the shelf where I can see it. Smiley

    And you avatar is pretty cool (that's a compliment response compliment, but still a 100% compliment).

    Herbie

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