Question 608516
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Hi
	m	f	Tot
Fr	10	15	25
So	13	3	16
Jr	3	5	8
Sr	2	16	18
Tot	28	39	{{{highlight(67)}}}
a) What is the probability that he chooses a sophomore or a female? 16/67)+ 39/67 - 3/67)= 52/67
b) What is the probability that he chooses someone who is male and a junior? 3/67 
c) If a female is selected at random what is the probability that she is a freshmen? 
P(A|B) = P(A and B)/P(B)
P(Fr|f)= {{{(15/67)/(39/67) = 15/39}}}