TABLE 4-2
An alcohol awareness task force at a Big-Ten university sampled 200 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.

-Referring to Table 4-2, what is the probability that a randomly selected student did well on the midterm and also went bar hopping the weekend before the midterm?
A) 30/200 or 15%
B) (80 + 30)/200 or 55%
C) (30 + 70)/200 or 50%
D) (80 + 30 + 70)/200 or 90%

Question

TABLE 4-2
An alcohol awareness task force at a Big-Ten university sampled 200 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.
 
-Referring to Table 4-2, what is the probability that a randomly selected student did well on the midterm and also went bar hopping the weekend before the midterm?
A) 30/200 or 15% 
B) (80 + 30)/200 or 55% 
C) (30 + 70)/200 or 50% 
D) (80 + 30 + 70)/200 or 90%

Quizplus · Accepted Answer

The probability is calculated by dividing the number of students who did well on the midterm and went bar hopping (30) by the total number of students (200), resulting in 30/200 or 15%.

TABLE 4-2 An Alcohol Awareness Task Force at a Big-Ten University Sampled