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anonymous

  • one year ago

A bag has 5 red marbles, 6 blue marbles and 4 black marbles. What is the probability of picking a red marble, replacing it, and then picking a black marble?

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  1. misty1212
    • one year ago
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    hi!!

  2. misty1212
    • one year ago
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    how many marbles total?

  3. anonymous
    • one year ago
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    15

  4. misty1212
    • one year ago
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    ok and haow many are red?

  5. anonymous
    • one year ago
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    5

  6. misty1212
    • one year ago
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    then what is the probability of picking a red one first?

  7. anonymous
    • one year ago
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    1/3 simplified

  8. misty1212
    • one year ago
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    right then you put the marble back, so there are still 15, how many are black?

  9. anonymous
    • one year ago
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    4

  10. misty1212
    • one year ago
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    so what is the probability of picking a black one ?

  11. anonymous
    • one year ago
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    4/15?

  12. misty1212
    • one year ago
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    yes

  13. misty1212
    • one year ago
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    to get your answer, multiply

  14. misty1212
    • one year ago
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    \[\frac{1}{3}\times \frac{4}{15}\]

  15. anonymous
    • one year ago
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    oh. i didnt know to multiply that. thank you!!

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