1Dfanatic
  • 1Dfanatic
You have a bag containing three red, seven green, and six blue pens. You choose tow pens at random. Find P(blue and blue) with replacing. Make sure to show/explain your work.
Mathematics
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
so let's see there are 16 pens.
anonymous
  • anonymous
Choosing blue is 3/8 chance
anonymous
  • anonymous
second time is 1/3

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More answers

anonymous
  • anonymous
multiply to find chance
welshfella
  • welshfella
first find probability of drawing a blue on a single draw. since the 2 draws are independent the above probability is multiplied by itself to give the answer you want.
anonymous
  • anonymous
The probability of picking two blue pens is approx 12.5%
1Dfanatic
  • 1Dfanatic
i got 1/3
welshfella
  • welshfella
No the probabiluty of a second blue is also 3/8 because the ball is replaced.
welshfella
  • welshfella
so P(blue and blue) = 3/8 * 3/8
1Dfanatic
  • 1Dfanatic
then it'd be 9/64
welshfella
  • welshfella
yes
1Dfanatic
  • 1Dfanatic
thank you
welshfella
  • welshfella
you understand why 1 draw = 3/8? 6 out of 16 = 3/8
welshfella
  • welshfella
yw
welshfella
  • welshfella
dahmanman would have been right if the ball was not replaced
welshfella
  • welshfella
- because there would have been 5 blues out of a total of 15 balls, which = 1/3

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