anonymous
  • anonymous
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 prize-winners. 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
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
anything?
anonymous
  • anonymous
the probability of winning a prize in one try is 1/3. Since the sample space remains the same for all tries, as the ball is replaced, we caN use binomial distribution in this. The prob. of winning 4 out of 12 is: 12C4 (1/3)^4 (2/3)^8
anonymous
  • anonymous
is 12C4 suppose to be 12/4?

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anonymous
  • anonymous
its 12!/(4!)(8!)
anonymous
  • anonymous
so i got 11880/ 24
anonymous
  • anonymous
which is 495
anonymous
  • anonymous
so multiply it by the others...
anonymous
  • anonymous
(1/3)^4 (2/3)^8? so i got 1/81 and 256/6561 now wat...
anonymous
  • anonymous
multiply the three
anonymous
  • anonymous
what 3?

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