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Math Help - basic probability problem

  1. #1
    Newbie TriForce's Avatar
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    basic probability problem

    Can't figure this problem out. Please point me in the right direction.

    Henrik, a soccer player, does score 9 out of 10 times. During the season he got to do 10 penalty shots. How big is the probability that he scores atleast 9 goal.

    Im thinking something like this...


    (9/10)^9 * (1/10) = think this gives me the probability of exactly 9 goals and 1 miss. Should i multiply it 10 times and add the 10/10 goal probability or, not sure...
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  2. #2
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    Re: basic probability problem

    Quote Originally Posted by TriForce View Post
    Henrik, a soccer player, does score 9 out of 10 times. During the season he got to do 10 penalty shots. How big is the probability that he scores atleast 9 goal.
    Actually exactly nine is $\displaystyle\binom{10}{1}(.9)^9(.1)^1=(.9)^9$. Add to that exactly ten $(.9)^{10}$.
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  3. #3
    Newbie TriForce's Avatar
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    Re: basic probability problem

    ah yes! thank you!
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