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  3. To test a theory. (Shared Birthdays)

To test a theory. (Shared Birthdays)

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  • D Dalek Dave

    Young Henry mentioned his mother's Birthday below and it reminded me of a probability experiment that states if 23 people are in a room, it is more likely than less that 2 of them share a birthday. What date is your birthday people? Mine is 31st March. Let us see if the first 23 posters to this can get a matching pair?

    ------------------------------------ "When Belly Full, Chin Hit Chest" Confucius 502BC

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    smcnulty2000
    wrote on last edited by
    #38

    June 7. First day of Vestalia.

    _____________________________ Will work for ... BRAINS!!! BRAINS!!!!

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    • D Dalek Dave

      Young Henry mentioned his mother's Birthday below and it reminded me of a probability experiment that states if 23 people are in a room, it is more likely than less that 2 of them share a birthday. What date is your birthday people? Mine is 31st March. Let us see if the first 23 posters to this can get a matching pair?

      ------------------------------------ "When Belly Full, Chin Hit Chest" Confucius 502BC

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      Johann Gerell
      wrote on last edited by
      #39

      July 16. When can we se your analysis of this experiment? ;)

      -- Time you enjoy wasting is not wasted time - Bertrand Russel

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      • C Christian Graus

        17 Feb

        Christian Graus Driven to the arms of OSX by Vista. Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

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        kduffingb
        wrote on last edited by
        #40

        17 Feb also :laugh: :laugh:

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        • O Oakman

          Jun 10

          Jon "One loves to possess arms, though they hope never to have occasion for them." --Thomas Jefferson to George Washington, 1796. Soap Box 1.0: the first, the original, reborn troll-less

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          JDL EPM
          wrote on last edited by
          #41

          Oakman wrote:

          Jun 10

          Does it count if this is my wife's birthday?

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          • D Dalek Dave

            Young Henry mentioned his mother's Birthday below and it reminded me of a probability experiment that states if 23 people are in a room, it is more likely than less that 2 of them share a birthday. What date is your birthday people? Mine is 31st March. Let us see if the first 23 posters to this can get a matching pair?

            ------------------------------------ "When Belly Full, Chin Hit Chest" Confucius 502BC

            M Offline
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            Mustafa Ismail Mustafa
            wrote on last edited by
            #42

            February 12

            If the post was helpful, please vote, eh! Current activities: Book: Devils by Fyodor Dostoyevsky Project: Hospital Automation, final stage Learning: Image analysis, LINQ Now and forever, defiant to the end. What is Multiple Sclerosis[^]?

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            • J Johann Gerell

              July 16. When can we se your analysis of this experiment? ;)

              -- Time you enjoy wasting is not wasted time - Bertrand Russel

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              Dalek Dave
              wrote on last edited by
              #43

              I will publish an analysis later today, but already there are several shared birthdays.

              ------------------------------------ "When Belly Full, Chin Hit Chest" Confucius 502BC

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              • D Dalek Dave

                I will publish an analysis later today, but already there are several shared birthdays.

                ------------------------------------ "When Belly Full, Chin Hit Chest" Confucius 502BC

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                Mustafa Ismail Mustafa
                wrote on last edited by
                #44

                So long as we get presents...

                If the post was helpful, please vote, eh! Current activities: Book: Devils by Fyodor Dostoyevsky Project: Hospital Automation, final stage Learning: Image analysis, LINQ Now and forever, defiant to the end. What is Multiple Sclerosis[^]?

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                • D Dalek Dave

                  Young Henry mentioned his mother's Birthday below and it reminded me of a probability experiment that states if 23 people are in a room, it is more likely than less that 2 of them share a birthday. What date is your birthday people? Mine is 31st March. Let us see if the first 23 posters to this can get a matching pair?

                  ------------------------------------ "When Belly Full, Chin Hit Chest" Confucius 502BC

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                  Pete OHanlon
                  wrote on last edited by
                  #45

                  This is just basic probability. One of my favourite maths experiments is to ask people whether or not they are more likely to roll two consecutive 6s with a dice or a 2 then a 3.

                  "WPF has many lovers. It's a veritable porn star!" - Josh Smith

                  As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

                  My blog | My articles | MoXAML PowerToys | Onyx

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                  • N NandoMan

                    I believe you are a bit wrong. If you have 366 people, you can guarantee that at least 2 people share birthdays. It´s called "the Pigeonhole principle" http://en.wikipedia.org/wiki/Pigeonhole_principle[^]

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                    Chris Quinn
                    wrote on last edited by
                    #46

                    You would need 367 if one of the people in the room was my younger brother - 29th Feb

                    ==================================== Transvestites - Roberts in Disguise! ====================================

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                    • C Chris Quinn

                      You would need 367 if one of the people in the room was my younger brother - 29th Feb

                      ==================================== Transvestites - Roberts in Disguise! ====================================

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                      blackjack2150
                      wrote on last edited by
                      #47

                      Chris Quinn wrote:

                      You would need 367 if one of the people in the room was my younger brother - 29th Feb

                      Or my former boss.

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                      • D Dalek Dave

                        Young Henry mentioned his mother's Birthday below and it reminded me of a probability experiment that states if 23 people are in a room, it is more likely than less that 2 of them share a birthday. What date is your birthday people? Mine is 31st March. Let us see if the first 23 posters to this can get a matching pair?

                        ------------------------------------ "When Belly Full, Chin Hit Chest" Confucius 502BC

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                        AndyStephens
                        wrote on last edited by
                        #48

                        The probability of at least two people sharing the same birthday is 0.5073. Yay, I've found a use for Wolfram Alpha! http://www04.wolframalpha.com/input/?i=same+birthday&f1=23&f=BirthdayProblem.n_23&x=5&y=9[^]

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                        • A AndyStephens

                          The probability of at least two people sharing the same birthday is 0.5073. Yay, I've found a use for Wolfram Alpha! http://www04.wolframalpha.com/input/?i=same+birthday&f1=23&f=BirthdayProblem.n_23&x=5&y=9[^]

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                          blackjack2150
                          wrote on last edited by
                          #49

                          That crashed my IE8.

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                          • D Dalek Dave

                            Young Henry mentioned his mother's Birthday below and it reminded me of a probability experiment that states if 23 people are in a room, it is more likely than less that 2 of them share a birthday. What date is your birthday people? Mine is 31st March. Let us see if the first 23 posters to this can get a matching pair?

                            ------------------------------------ "When Belly Full, Chin Hit Chest" Confucius 502BC

                            D Offline
                            D Offline
                            Dan_Martin
                            wrote on last edited by
                            #50

                            9th May

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                            • D Dalek Dave

                              Young Henry mentioned his mother's Birthday below and it reminded me of a probability experiment that states if 23 people are in a room, it is more likely than less that 2 of them share a birthday. What date is your birthday people? Mine is 31st March. Let us see if the first 23 posters to this can get a matching pair?

                              ------------------------------------ "When Belly Full, Chin Hit Chest" Confucius 502BC

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                              ormonds
                              wrote on last edited by
                              #51

                              10 Dec

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                              • L Lost User

                                Trafalgar Day. (that might make some scratch their heads!)

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                                ormonds
                                wrote on last edited by
                                #52

                                Now that has to be Oct 30 1805, doesn't it?

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                                • D Dalek Dave

                                  Young Henry mentioned his mother's Birthday below and it reminded me of a probability experiment that states if 23 people are in a room, it is more likely than less that 2 of them share a birthday. What date is your birthday people? Mine is 31st March. Let us see if the first 23 posters to this can get a matching pair?

                                  ------------------------------------ "When Belly Full, Chin Hit Chest" Confucius 502BC

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                                  John Oxley
                                  wrote on last edited by
                                  #53

                                  16th of August

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                                  • D Dalek Dave

                                    Young Henry mentioned his mother's Birthday below and it reminded me of a probability experiment that states if 23 people are in a room, it is more likely than less that 2 of them share a birthday. What date is your birthday people? Mine is 31st March. Let us see if the first 23 posters to this can get a matching pair?

                                    ------------------------------------ "When Belly Full, Chin Hit Chest" Confucius 502BC

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                                    0x3c0
                                    wrote on last edited by
                                    #54

                                    July 19th. There's that theory broken ;P

                                    Between the idea And the reality Between the motion And the act Falls the Shadow

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                                    • O ormonds

                                      Now that has to be Oct 30 1805, doesn't it?

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                                      The Real Geek
                                      wrote on last edited by
                                      #55

                                      Hmm, 21st I think, which is a shame because it would have matched mine - 30th Oct :-)

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                                      • O ormonds

                                        Now that has to be Oct 30 1805, doesn't it?

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                                        Lost User
                                        wrote on last edited by
                                        #56

                                        No. http://www.bbc.co.uk/history/british/empire_seapower/launch_ani_trafalgar.shtml[^]

                                        modified on Wednesday, August 5, 2009 5:37 AM

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                                        • T The Real Geek

                                          Hmm, 21st I think, which is a shame because it would have matched mine - 30th Oct :-)

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                                          Lost User
                                          wrote on last edited by
                                          #57

                                          The Real Geek wrote:

                                          21st I think

                                          :thumbsup:

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