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2 July, 00:38

21% of the students had a score of 80/100 or higher on both midterms. 25% had a score of 80/100 or higher on midterm 1. what percentage of the students who had score of 80/100 or higher on midterm 1 had a score of 80/100 or higher on midterm 2

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  1. 2 July, 01:19
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    Let event A = high score on midterm1.

    Let event B = high score on midterm2.

    You want P (B|A).

    P (B|A) = P (B&A) / P (A)

    P (B|A) = 0.21/0.25

    P (B|A) = 84%

    84% of students who had a high score on midterm1 had a high score on midterm 2.
  2. 2 July, 04:21
    0
    84% of students who had score of 80/100 or higher on midterm 1
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