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muscrat123

  • one year ago

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

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  1. muscrat123
    • one year ago
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    @Hero @Preetha

  2. muscrat123
    • one year ago
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    anybody?

  3. muscrat123
    • one year ago
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    @nerlineg

  4. anonymous
    • one year ago
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    On any draw, what is the probability of choosing a purple marble?

  5. muscrat123
    • one year ago
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    idk, but i think it is 20

  6. anonymous
    • one year ago
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    How many purple marbles are there?

  7. kropot72
    • one year ago
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    The probability of drawing a purple marble is 2/30 on each trial. The expected number of purple marbles after 300 trials is therefore \[\large \frac{2}{30}\times\frac{300}{1}=?\]

  8. muscrat123
    • one year ago
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    i think so because all of the marbles added up = 30, and 30 x 10 = 300

  9. muscrat123
    • one year ago
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    2 x 10 = 20

  10. kropot72
    • one year ago
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    Correct.

  11. muscrat123
    • one year ago
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    and 600/30

  12. muscrat123
    • one year ago
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    so it is 20?

  13. kropot72
    • one year ago
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    Yes.

  14. muscrat123
    • one year ago
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    thank u!

  15. kropot72
    • one year ago
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    you're welcome :)

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