1. ## 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...

2. ## Re: basic probability problem

Originally Posted by TriForce
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 $(.9)^{10}$.

3. ## Re: basic probability problem

ah yes! thank you!