Your probability of getting the flu this year is .13. The probability that you will get the flu and run a high fever is .05. Suppose you come down with the flu. What is the probability that you will get the high fever, given that you have the flu?

A. .15
B. .95
C. .83
D. .03
E. .38

Question

Your probability of getting the flu this year is .13. The probability that you will get the flu and run a high fever is .05. Suppose you come down with the flu. What is the probability that you will get the high fever, given that you have the flu?


 		A.	.15
 		B.	.95
 		C.	.83
 		D.	.03
 		E.	.38

anonymous · Answer

P(A|B)=P(A and B)/P(B)
letting A and B be the event that you have the flu and hive a high fever 
and letting B be the probability that you have the flu
we get 
P(A|B) = .05/.13 = .38

anonymous · Answer

Thank you for the explanation @helper_michael