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An alcohol awareness task force at Big-Ten university sampled 20 students 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 result was obtained.
Did Well on Midterm Did Poorly on Midterm
Studying for exam 80 20
Went Bar Hopping 30 70
Referring to the table, what is the probability that a randomly selected student who went bar hopping will do well on the midterm? 1. 30/100 or 30% 2. 30/110 or 27.27% 3. 30/200 or 15% 4. (100/200) * (110/200) or 27.50%
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