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    janemorales's Avatar
    janemorales Posts: 26, Reputation: 1
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    #1

    Jul 9, 2008, 10:14 AM
    Empirical probability
    Did I do this right?

    Ninety students will graduate from Lima Shawnee High School this spring. Of the 90 students, 50 are planning to attend college. Two students are to be picked at random to carry flags at graduation.

    a. What is the probability both of the selected students plan to attend college?
    P= I used the empirical approach to determine that there is a 1.2%p that the student chosen will carry the flag.

    b. What is the probability one of the two selected students plans to attend college?
    P= I used the empirical approach again to determine that there is a 45% p that the student carrying the flag will be attending college.
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Jul 9, 2008, 10:22 AM
    Your answers are incorrect. For (a) the probability that both students plan to attend college would be (50/90)*(49/89), which is around 30.5% As for (b), the probability of having one plan to attend and one not is (50/90)*(40/89)*2, or about 50%.

    What do you mean by "using the empirical approach"?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #3

    Jul 10, 2008, 12:04 AM
    ^^ She uses quite weird words heh? First conditional probability and now empirical probability!
    morgaine300's Avatar
    morgaine300 Posts: 6,561, Reputation: 276
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    #4

    Jul 12, 2008, 08:58 PM
    What's weird about conditional probabilities?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #5

    Jul 12, 2008, 09:12 PM
    Well, I never heard of that. But independent and dependent probability. Perhaps I will in higher classes!

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