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Maths problem 2

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  • L Lost User

    I have two children. One is a boy born on a Tuesday. What is the probability I have two boys?

    Brian C HartB Offline
    Brian C HartB Offline
    Brian C Hart
    wrote on last edited by
    #4

    Unless, of course, your two children are twins. If they are twins, and they are identical, then the probability is 100% since identical twins always are of the same gender. If not, then the probability is 50%. If the children are not twins, the fact that the boy was born on a Tuesday is irrelevant.

    Sincerely Yours, Brian Hart

    L 1 Reply Last reply
    0
    • L Lost User

      I have two children. One is a boy born on a Tuesday. What is the probability I have two boys?

      D Offline
      D Offline
      Dalek Dave
      wrote on last edited by
      #5

      I will rule myself out of this one as I know the answer having just heard it on Radio 4 :)

      ------------------------------------ I will never again mention that I was the poster of the One Millionth Lounge Post, nor that it was complete drivel. Dalek Dave

      1 Reply Last reply
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      • L Lost User

        I have two children. One is a boy born on a Tuesday. What is the probability I have two boys?

        realJSOPR Offline
        realJSOPR Offline
        realJSOP
        wrote on last edited by
        #6

        Zero. You don't have enough testosterone yourself to father a boy.

        .45 ACP - because shooting twice is just silly
        -----
        "Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
        -----
        "The staggering layers of obscenity in your statement make it a work of art on so many levels." - J. Jystad, 2001

        L 1 Reply Last reply
        0
        • L Lost User

          I have two children. One is a boy born on a Tuesday. What is the probability I have two boys?

          L Offline
          L Offline
          Lost User
          wrote on last edited by
          #7

          I just ate some watermelon. What is the probability that the probability that I have a boy who was born on a Tuesday?

          L 1 Reply Last reply
          0
          • L Lost User

            I have two children. One is a boy born on a Tuesday. What is the probability I have two boys?

            CPalliniC Offline
            CPalliniC Offline
            CPallini
            wrote on last edited by
            #8

            Friday. :)

            If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
            This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke
            [My articles]

            In testa che avete, signor di Ceprano?

            1 Reply Last reply
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            • Brian C HartB Brian C Hart

              Unless, of course, your two children are twins. If they are twins, and they are identical, then the probability is 100% since identical twins always are of the same gender. If not, then the probability is 50%. If the children are not twins, the fact that the boy was born on a Tuesday is irrelevant.

              Sincerely Yours, Brian Hart

              L Offline
              L Offline
              Lost User
              wrote on last edited by
              #9

              Brian C. Hart, Ph.D. wrote:

              the fact that the boy was born on a Tuesday is irrelevant

              On the contrary it has everything to do with it.

              1 Reply Last reply
              0
              • realJSOPR realJSOP

                Zero. You don't have enough testosterone yourself to father a boy.

                .45 ACP - because shooting twice is just silly
                -----
                "Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
                -----
                "The staggering layers of obscenity in your statement make it a work of art on so many levels." - J. Jystad, 2001

                L Offline
                L Offline
                Lost User
                wrote on last edited by
                #10

                I already have. And anyway shut your mouth or ill go and 1 vote some of your articles.

                realJSOPR E 2 Replies Last reply
                0
                • H hairy_hats

                  13/27?

                  L Offline
                  L Offline
                  Lost User
                  wrote on last edited by
                  #11

                  Correct!

                  H 1 Reply Last reply
                  0
                  • H hairy_hats

                    13/27?

                    CPalliniC Offline
                    CPalliniC Offline
                    CPallini
                    wrote on last edited by
                    #12

                    That is 0.

                    If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
                    This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke
                    [My articles]

                    In testa che avete, signor di Ceprano?

                    H 1 Reply Last reply
                    0
                    • L Lost User

                      I already have. And anyway shut your mouth or ill go and 1 vote some of your articles.

                      realJSOPR Offline
                      realJSOPR Offline
                      realJSOP
                      wrote on last edited by
                      #13

                      Buying, renting, and adopting kids doesn't count.

                      .45 ACP - because shooting twice is just silly
                      -----
                      "Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
                      -----
                      "The staggering layers of obscenity in your statement make it a work of art on so many levels." - J. Jystad, 2001

                      1 Reply Last reply
                      0
                      • L Lost User

                        I have two children. One is a boy born on a Tuesday. What is the probability I have two boys?

                        A Offline
                        A Offline
                        Abhinav S
                        wrote on last edited by
                        #14

                        I don't know.

                        My signature "sucks" today

                        1 Reply Last reply
                        0
                        • L Lost User

                          I have two children. One is a boy born on a Tuesday. What is the probability I have two boys?

                          Brian C HartB Offline
                          Brian C HartB Offline
                          Brian C Hart
                          wrote on last edited by
                          #15

                          Null hypothesis probability of 0.02.

                          Sincerely Yours, Brian Hart

                          1 Reply Last reply
                          0
                          • L Lost User

                            I already have. And anyway shut your mouth or ill go and 1 vote some of your articles.

                            E Offline
                            E Offline
                            Enver Maroshi
                            wrote on last edited by
                            #16

                            How does your wife get along with your neighbor?

                            1 Reply Last reply
                            0
                            • L Lost User

                              Correct!

                              H Offline
                              H Offline
                              hairy_hats
                              wrote on last edited by
                              #17

                              I read the article too...

                              1 Reply Last reply
                              0
                              • L Lost User

                                I just ate some watermelon. What is the probability that the probability that I have a boy who was born on a Tuesday?

                                L Offline
                                L Offline
                                Luc Pattyn
                                wrote on last edited by
                                #18

                                watermelons need more time. :)

                                Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]


                                I only read formatted code with indentation, so please use PRE tags for code snippets.


                                I'm not participating in frackin' Q&A, so if you want my opinion, ask away in a real forum (or on my profile page).


                                1 Reply Last reply
                                0
                                • CPalliniC CPallini

                                  That is 0.

                                  If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
                                  This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke
                                  [My articles]

                                  H Offline
                                  H Offline
                                  hairy_hats
                                  wrote on last edited by
                                  #19

                                  Only in integer maths.

                                  1 Reply Last reply
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