STUDENT ENROLLMENT At a certain medical school, of the students are from a minority group. Of…

STUDENT ENROLLMENT At a certain medical school, of the students are from a minority group. Of those students who belong to a minority group, are black.

a. What is the probability that a student selected at random from this medical school is black?

b. What is the probability that a student selected at random from this medical school is black if it is known that the student is a member of a minority group?