briana.img
  • briana.img
Someone help me understand this problem?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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briana.img
  • briana.img
A bag has 4 green marbles, 3 red marbles, and 3 yellow marbles. What is the probability that you pick a green marble, do not replace it, and pick a red marble?
Owlcoffee
  • Owlcoffee
Well, I believe these are two scenarios. First calculate the probability you have to pick a green marble, you count all the marbles and and the green marbles: \[\frac{ 4 }{ 10 }.100\]
briana.img
  • briana.img
why the 100?

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More answers

Owlcoffee
  • Owlcoffee
it's there by mere definition, but it's a formula that gives you the probability.
Owlcoffee
  • Owlcoffee
You have to first perform the division, remember that.
briana.img
  • briana.img
I got 40
Owlcoffee
  • Owlcoffee
Good, now, that gives the probability you would have to get a green marble, now, you won't put it back in the bag, so now you have a total of 9 marbles inside the bag. What would be the probability to find a red marble in the new quatity?: \[\frac{ 3 }{ 9 }.100\]
briana.img
  • briana.img
got 33.33
perl
  • perl
Better not multiply by a 100. Only if you want to convert the final answer to a percentage $$ \Large \sf Probability = \frac {4}{10}\cdot \frac{3}{9}$$
briana.img
  • briana.img
2/15??
perl
  • perl
yes
briana.img
  • briana.img
awwwh okay thank you! i'll look at this next time i have trouble with this
Owlcoffee
  • Owlcoffee
Haha, I was doing it by parts, but thanks, perl.
briana.img
  • briana.img
@perl @Owlcoffee so for the problem A bag has 5 red marbles, 6 blue marbles and 4 black marbles. What is the probability of picking a blue marble, replacing it, and then picking another blue marble? the answer would be 4/25 ?

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