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mariomintchev

  • one year ago

a student signs up for 3 courses for this semester. the probability of getting an a in class 1 is 0.3. the probability of getting an a in class 2 is 0.4. the probability of getting an a in class 3 is 0.5.

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  1. mariomintchev
    • one year ago
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    a) what is the probability of getting 3 As this semester? b) what is the probability of getting 2 As this semester? c) what is the probability of getting at least 1 A this semester?

  2. satellite73
    • one year ago
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    a) multiply the three numbers together \(.3\times .4\times .5\) assuming independence

  3. mariomintchev
    • one year ago
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    yeah i was thinking the same thing for A but what about the others

  4. satellite73
    • one year ago
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    b) two A's you have to work by cases

  5. satellite73
    • one year ago
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    class 1, class 2, class 3 A A not A \(.3\times .4\times .5\) A not A A \(.3\times .6\times .5\) not A A A \(.7\times .4\times .5\) find these three numbers, add them up

  6. satellite73
    • one year ago
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    c) at least on A is easiest found by computing the probability that you get exactly no A and subtract that number from 1

  7. satellite73
    • one year ago
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    *one A

  8. satellite73
    • one year ago
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    i.e. \(1-.7\times .6\times .5\)

  9. mariomintchev
    • one year ago
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    Thanks big time!

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