Question

From a group of 6 freshmen, 5 sophomores, and 8 seniors, a

student is to be selected at random. What is the probability
that the selected student is
a) a senior
b) not a freshman?

Answer 1

a) 8/19 b)13/19

Explanation:

Probability is desired outcome over total possible outcomes. So the denominator for both a and b is 6+5+8=19. For a since there are 8 seniors the probability is 8/19 and for b since there are 5+8=13 people who aren't freshman the probability is 13/19.