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Math Help - Probabilty Question

  1. #1
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    Probabilty Question

    p=80% (chance of winning a game)
    n=5 (number of games)

    What is the probability that you will win at least 4 games (find the probability that x is greater than or equal to 4).
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  2. #2
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    Hello, JohhnySD!

    This is a Binomial probability.


    p = 80% (chance of winning a game)
    n = 5 (number of games)

    What is the probability that you will win at least 4 games?

    "Win at least 4 games" means "Win 4 games or Win 5 games."

    . . P(x\!=\!4) \;=\;{5\choose4}(0.8)^4(0.2)^1 \;=\;0.4096

    . . P(x\!=\!5) \;=\;{5\choose5}(0.8)^5(0.2)^0 \;=\;0.32768


    Therefore: . P(x \geq 4) \;=\;0.4096 + 0.32768 \;=\;0.73728 \;\approx\;73.7%

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  3. #3
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    thank you so much!!
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  4. #4
    Grand Panjandrum
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    Quote Originally Posted by JohhnySD View Post
    thank you so much!!
    Why not use the thanks button then?

    CB
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