1. #1
    JohnGalt2341
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    Probability formula question

    Let's say I decide to flip a fair coin 45 times. What is the formula I would use to figure out what the chances are of getting 28 or more Heads? I'm nearly certain that this is a simple formula but for some reason I can't remember it. Any help is appreciated. Thanks!

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  2. #2
    Waterstpub87
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    Probability Mass Function. =binom.dist(28,45,0.5,False)

    Its coming up like 3% or so
    Last edited by Waterstpub87; 12-07-17 at 02:20 PM.
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  3. #3
    JohnGalt2341
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    Quote Originally Posted by Waterstpub87 View Post
    Probability Mass Function. =binom.dist(28,45,0.5,False)

    Its coming up like 3% or so
    Thanks a bunch!

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  4. #4
    PeterJohnson
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    Waterstpub be my Jim Cramer for a second what crypto stock besides (Bitcoin) should you advise me to buy,buy,buy!?
    Quote Originally Posted by Waterstpub87 View Post
    Probability Mass Function. =binom.dist(28,45,0.5,False)

    Its coming up like 3% or so

  5. #5
    Bostongambler
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    Is the coin black?

  6. #6
    JohnGalt2341
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    Quote Originally Posted by Bostongambler View Post
    Is the coin black?
    No, but what has a Head and a Tail and has no legs and is often brown?

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  7. #7
    Waterstpub87
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    Quote Originally Posted by PeterJohnson View Post
    Waterstpub be my Jim Cramer for a second what crypto stock besides (Bitcoin) should you advise me to buy,buy,buy!?
    Not the person you want to ask. I am normally the person who tell everyone not to buy stuff.

    However, long term, buy an S&P 400 etf.

    Not into crypto stuff at all.

  8. #8
    indio
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    Quote Originally Posted by JohnGalt2341 View Post
    Let's say I decide to flip a fair coin 45 times. What is the formula I would use to figure out what the chances are of getting 28 or more Heads? I'm nearly certain that this is a simple formula but for some reason I can't remember it. Any help is appreciated. Thanks!
    The correct answer is 6.76%

    The 3% answer was erroneous, as the chances of getting EXACTLY 28 heads is 3.1%, whereas since you asked what the chances of getting 28 OR MORE heads is, the correct answer is 6.76%

    https://stattools.crab.org/Calculato...alculator.html
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  9. #9
    Waterstpub87
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    Quote Originally Posted by indio View Post
    The correct answer is 6.76%

    The 3% answer was erroneous, as the chances of getting EXACTLY 28 heads is 3.1%, whereas since you asked what the chances of getting 28 OR MORE heads is, the correct answer is 6.76%

    https://stattools.crab.org/Calculato...alculator.html
    You're right. In excel this would be 1 - Binomdist(27,45,.5,True).

  10. #10
    gojetsgomoxies
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    binomial calculator

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