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A sample of 200 students at a Big-Ten university was taken after the midterm to ask them whether they went bar hopping the weekend before the midterm or spent the weekend studying, and whether they did well or poorly on the midterm.  The following table contains the result.  Did Well in MidtermDid Poorly in MidtermStudying for Exam7030Went Bar Hopping2080 Referring to the table, of those who went bar hopping the weekend before the midterm in the sample, _______ percent of them did well on the midterm. A. 30 B. 22.2 C. 55 D. 20

Question

A sample of 200 students at a Big-Ten university was taken after the midterm to ask them whether they went bar hopping the weekend before the midterm or spent the weekend studying, and whether they did well or poorly on the midterm.  The following table contains the result.  Did Well in MidtermDid Poorly in MidtermStudying for Exam7030Went Bar Hopping2080 Referring to the table, of those who went bar hopping the weekend before the midterm in the sample, _______ percent of them did well on the midterm. A. 30 B. 22.2 C. 55 D. 20

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Solution

To find the percentage of students who went bar hopping and did well on the midterm, we need to divide the number of students who went bar hopping and did well by the total number of students who went bar hopping.

From the table, we can see that 20 students went bar hopping and did well on the midterm, and a total of 100 students (20 who did well + 80 who did poorly) went bar hopping.

So, the calculation would be (20/100)*100 = 20%.

Therefore, the answer is D. 20.

This problem has been solved

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