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anonymous
 5 years ago
during a basketball shooting contest, each contestant gets 10 shots. for each shot he attempts, parik's probability of making a basket is 55%. What is the probability he will make at least 8 shots in his 10 attempts? express the answer as a percent.
A.) 0.3%
B.) 1.6%
C.) 8.4%
D.) 10.0%
anonymous
 5 years ago
during a basketball shooting contest, each contestant gets 10 shots. for each shot he attempts, parik's probability of making a basket is 55%. What is the probability he will make at least 8 shots in his 10 attempts? express the answer as a percent. A.) 0.3% B.) 1.6% C.) 8.4% D.) 10.0%

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0at least 8 shots means you have have to compute the probability he makes 8, 9 and 10. We are assuming the shots are independent so use binomial. \[P(x=8)=\dbinom{10}{8}(.55)^8(.45)^2\]

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0i can write out the others if you like.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0the general formula is \[P(x=k)=\dbinom{n}{k}p^k(1p)^{nk}\] i used it for n = 10, k = 8 and p=.55 for k = 9 you get \[P(x=9)=\dbinom{10}{9}(.55)^9(.44)^{1}\]

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0and k= 19 you get \[\dbinom{10}{10}(.55)^{10}\]

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0\[\dbinom{10}{8} = \frac{10\times 9}{2}=45\] \[\dbinom{10}{9} = 10\] \[\dbinom{10}{10}=1\] the rest you need a calculator for.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0OKAY so what do i put in the caculator? im so confused

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0oh sorry . you need to put the \[(.55)^8(.45)^2\] part in the calculator because you certainly cannot do it by hand. answer is \[45 \times (.55)^8(.45)^2 + 10 \times (.55)^9(.45)+(.55)^{10}\]

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0i got .0995 rounded to .10= 10%

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0thanx so much u deserve a medal

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0you are welcome. thank you. btw if it is not clear why this formula is the correct one let me know. it is not too hard to explain.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0i just have one more problem to do and im not to good with probability Karin is playing a game at an after school carnival. There are a number of table tennis balls in a bag, and 1/3 of them are marked as prizewinners. A player randomly selects a ball from the bag, checks to see if they won a prize, and then replaces the ball. If karin plays the game 12 times, what is the probability that she will win a prize exactly 4 times? A.) 0.0004 B.) 0.012 C.) 0.238 D.)0.25
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