1. 10-20-09 01:08 PM #1
    jpete1966
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    What's the % on this?

    If I were to flip a coin 73 times what % of the time will it come up 18 times one way and 55 times another?
    Last edited by jpete1966; 10-20-09 at 03:19 PM.
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  2. 10-20-09 03:45 PM #2
    u21c3f6
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    1.16449E-05

    Assuming the coin is 50-50, the answer is for 18 heads or 18 tails. For just one specific way, 5.82247E-06

    Why?

    Joe.
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  3. 10-20-09 04:56 PM #3
    LT Profits
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    The OP said in another thread that he is 18-55 in his last 73 plays. That sounds like my baseball record.
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  4. 10-20-09 05:23 PM #4
    jpete1966
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    So is that 1.16% that it hits exactly 18? What would the % be for up to 18 out of 73?
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  5. 10-20-09 05:38 PM #5
    polson22
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    i asked this question elsewhere the other day. and someone suggested the following.

    google binomial distribution calculator. the first one listed worked for me
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  6. 10-21-09 08:19 AM #6
    u21c3f6
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    Quote Originally Posted by jpete1966 View Post
    So is that 1.16% that it hits exactly 18? What would the % be for up to 18 out of 73?
    For exactly 18 wins it would be: 0.000582247%

    For 0 to 18 wins it would be: 0.000845681%

    In other words, something that really shouldn't happen if one is truly wagering on 50-50 events. On the other hand you may have truly found an awesome edge! It's just the opposite of what you think.

    http://stattrek.com/Tables/Binomial.aspx

    Joe.
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