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A sample of 200 students at a Big-Ten university w...

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 results. Did Well in Midterm Did Poorly in Midterm Studying for Exam 80 20 Went bar hopping 30 70 If the sample is a good representation of the population, we can expect percent of the students in the population to spend the weekend studying and do poorly on the midterm.

A、10

B、20

C、45

D、50

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