Whats the probability........

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • rake922
    SBR Posting Legend
    • 12-23-07
    • 11692

    #1
    Whats the probability........
    Whats the probability of flipping a coin 6 times... and not getting a 3heads/3tails split ?
  • durito
    SBR Posting Legend
    • 07-03-06
    • 13173

    #2
    68.75%
    Comment
    • epsacc
      SBR Rookie
      • 03-31-08
      • 1

      #3
      Assuming that p(heads) = p(tails) = 0.5, probability of not getting 3 heads and 3 tails is given by 1 - probability(3 heads in 6 tosses).

      1 - p(3 Heads) = 1 - (6 choose 3)*p(heads)^3*p(tails)^3 = 1 - (6 choose 3)*(.5)^3*(.5)^3 = 11/16 = 68.75%
      Comment
      • tool21
        SBR High Roller
        • 01-25-08
        • 102

        #4
        I did a 'study' i guess you could say on this because i was building a chase system based on a 50% chance. The thing is you have a 50% chance every flip. It doesn't change with past flips because sample sizes are to small.

        Great example.

        Many people on this forum if they were to flip a coin the rest of their lives would have a streak of 20 heads or 20 tails in a row. Same goes with gambling. It's unpredictable and gambling has no memory. You have about a 50% give or take chance EVERY GAME. It is pretty common to flip a coin heads 6 times in a row believe it or not. I'm pretty sure it will happen within 200 bets.
        Comment
        • rake922
          SBR Posting Legend
          • 12-23-07
          • 11692

          #5
          Originally posted by tool21
          I did a 'study' i guess you could say on this because i was building a chase system based on a 50% chance. The thing is you have a 50% chance every flip. It doesn't change with past flips because sample sizes are to small.

          Great example.

          Many people on this forum if they were to flip a coin the rest of their lives would have a streak of 20 heads or 20 tails in a row. Same goes with gambling. It's unpredictable and gambling has no memory. You have about a 50% give or take chance EVERY GAME. It is pretty common to flip a coin heads 6 times in a row believe it or not. I'm pretty sure it will happen within 200 bets.
          so are you disagreeing with the 2 above answers?
          Comment
          • tool21
            SBR High Roller
            • 01-25-08
            • 102

            #6
            Believe it or not i must have read your post wrong....i'm sorry. I for some reason thought it was for 6 of the same in a row. shit i have no idea.

            I built a 'simulator' in excel and recorder the results of about 500,000 flips at 50% each. The results were crazy. Basically any combination at any time over that many flips. I can't answer your question though, don't have time to think about it i have a test at 8am. Sorry bro!
            Last edited by tool21; 04-01-08, 12:05 AM.
            Comment
            • pico
              BARRELED IN @ SBR!
              • 04-05-07
              • 27321

              #7
              Originally posted by rake922
              Whats the probability of flipping a coin 6 times... and not getting a 3heads/3tails split ?
              are you going to use this in some kind of crazy parlay strategy?
              Comment
              • DrunkenLullaby
                SBR MVP
                • 03-30-07
                • 1631

                #8
                Originally posted by tool21
                Believe it or not i must have read your post wrong....i'm sorry. I for some reason thought it was for 6 of the same in a row. shit i have no idea.

                I built a 'simulator' in excel and recorder the results of about 500,000 flips at 50% each. The results were crazy. Basically any combination at any time over that many flips. I can't answer your question though, don't have time to think about it i have a test at 8am. Sorry bro!
                I don't mean this to be offensive, but it's the truth that if you can't do this calc, you really shouldn't be building simulators and models.
                Comment
                • pico
                  BARRELED IN @ SBR!
                  • 04-05-07
                  • 27321

                  #9
                  i think i got it. you must be thinking about reverse round robin parlays. you get screwed if you split 3-3.
                  Comment
                  • tool21
                    SBR High Roller
                    • 01-25-08
                    • 102

                    #10
                    Originally posted by DrunkenLullaby
                    I don't mean this to be offensive, but it's the truth that if you can't do this calc, you really shouldn't be building simulators and models.
                    Maybe you should read what i wrote. I didn't say i didn't know how to do it. I said "don't have time to think about it i have a test at 8am. Sorry bro!" I'll leave it at that. you don't know me so don't act like ya do.

                    26-10 NCAAB this year documented at EOG
                    102-74 ATS NBA this year documented at EOG

                    I think i know a little bit about handicapping and probabilities Mr. Lullaby. I mean being in my senior year of college and majoring in Mathmatics doesn't help does it? I haven't taken classes past calc 2? I've taken every math course under the sun. Come on dude... be serious it's what i do hahahaha
                    Last edited by tool21; 04-01-08, 12:06 PM.
                    Comment
                    • donjuan
                      SBR MVP
                      • 08-29-07
                      • 3993

                      #11
                      26-10 NCAAB this year documented at EOG
                      102-74 ATS NBA this year documented at EOG

                      I think i know a little bit about handicapping and probabilities Mr. Lullaby.
                      Apparently none of your classes taught you anything about sample sizes.
                      Comment
                      • tool21
                        SBR High Roller
                        • 01-25-08
                        • 102

                        #12
                        Originally posted by donjuan
                        Apparently none of your classes taught you anything about sample sizes.

                        That's why i'm here right?



                        Sorry bout getting this off topic you will see no more posts from me in this thread unless it's helpful, sorry!
                        Comment
                        • DrunkenLullaby
                          SBR MVP
                          • 03-30-07
                          • 1631

                          #13
                          Originally posted by tool21
                          Maybe you should read what i wrote. I didn't say i didn't know how to do it. I said "don't have time to think about it i have a test at 8am. Sorry bro!" I'll leave it at that. you don't know me so don't act like ya do.

                          26-10 NCAAB this year documented at EOG
                          102-74 ATS NBA this year documented at EOG

                          I think i know a little bit about handicapping and probabilities Mr. Lullaby. I mean being in my senior year of college and majoring in Mathmatics doesn't help does it? I haven't taken classes past calc 2? I've taken every math course under the sun. Come on dude... be serious it's what i do hahahaha
                          Dude, in my first quarter at UCLA I learned how to do calculations like this - in an Econ class nonetheless. I'm sorry, but I don't understand how a senior math major, particularly one who's taken Combinatorics (one of the math classes under the sun) could forget, even for a second, how to do this problem.
                          Comment
                          • pico
                            BARRELED IN @ SBR!
                            • 04-05-07
                            • 27321

                            #14
                            Originally posted by tool21
                            Maybe you should read what i wrote. I didn't say i didn't know how to do it. I said "don't have time to think about it i have a test at 8am. Sorry bro!" I'll leave it at that. you don't know me so don't act like ya do.

                            26-10 NCAAB this year documented at EOG
                            102-74 ATS NBA this year documented at EOG

                            I think i know a little bit about handicapping and probabilities Mr. Lullaby. I mean being in my senior year of college and majoring in Mathmatics doesn't help does it? I haven't taken classes past calc 2? I've taken every math course under the sun. Come on dude... be serious it's what i do hahahaha
                            april fools
                            Comment
                            SBR Contests
                            Collapse
                            Top-Rated US Sportsbooks
                            Collapse
                            Working...