$$\text { TABLE 4-2 }$$ An Alcohol Awareness Task Force at a Big-Ten University Sampled

$$\text { TABLE 4-2 }$$ 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.
$$\begin{array}{l}\begin{array} { lcc} &\text { Did Well on Midterm}& \text {Did Poorlyon Midterm }\\\hline \text { Studyingror Exam } & 80 & 20 \\\text { Went Bar Hopping } & 30 & 70\end{array}\end{array}$$

-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) (80 + 30) /200 or 55%
B) 30/200 or 15%
C) (80 + 30 + 70) /200 or 90%
D) (30 + 70) /200 or 50%