muscrat123
  • muscrat123
WILL MEDAL AND FAN (06.02)A bag contains 30 marbles, 3 of which are blue, 20 are red, 5 are green, and 2 are purple. Emerson takes a marble out of the bag, records the color, and returns it to the bag. How many purple marbles should he expect after 300 trials? 20 30 50 200
Mathematics
katieb
  • katieb
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muscrat123
  • muscrat123
muscrat123
  • muscrat123
anybody?
muscrat123
  • muscrat123

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anonymous
  • anonymous
On any draw, what is the probability of choosing a purple marble?
muscrat123
  • muscrat123
idk, but i think it is 20
anonymous
  • anonymous
How many purple marbles are there?
kropot72
  • kropot72
The probability of drawing a purple marble is 2/30 on each trial. The expected number of purple marbles after 300 trials is therefore \[\large \frac{2}{30}\times\frac{300}{1}=?\]
muscrat123
  • muscrat123
i think so because all of the marbles added up = 30, and 30 x 10 = 300
muscrat123
  • muscrat123
2 x 10 = 20
kropot72
  • kropot72
Correct.
muscrat123
  • muscrat123
and 600/30
muscrat123
  • muscrat123
so it is 20?
kropot72
  • kropot72
Yes.
muscrat123
  • muscrat123
thank u!
kropot72
  • kropot72
you're welcome :)

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