Determ ine w hether the follow ing probabilities are best categorized as subjective, em pirical, or a priori probabilities.

a. Before flipping a fair coin, Sunil assesses th a t he has a 50% chance o f obtaining tails.

b. At the beginning o f the semester, John believes he has a 90% chance o f receiving straight A's.

c. A political reporter announces th a t there is a 40% chance that the next person to come out o f the conference room w ill be a Republican, since there are 60 Republicans and 90 Democrats in the room. P-258