SOLUTION: Can someone please help I have never done this before and I have been out of school for over 10 years. Please Help!!!!!!!!!!!!!!!! given that P(A) = 0.3 and P(B) = 0.9, and P(A

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Question 446000: Can someone please help I have never done this before and I have been out of school for over 10 years. Please Help!!!!!!!!!!!!!!!!
given that P(A) = 0.3 and P(B) = 0.9, and P(A and B) = 0.18, determine P(B|A).
a) 0.30
b) 0.60
c) 0.15
d) 0.20
Answer by ewatrrr(24785)   (Show Source): You can put this solution on YOUR website!
 

Hi,

Note: P(A|B) = P(A and B)/P(B)  |P(A|B)read Probability of A, given B occurred

  P(A) = 0.3 and P(B) = 0.9 

P(A and B) = P(A)*P(B) 

In this example:

P(A and B)= .3*.9 = 0.18

P(A|B) = .18/.9 = .2

 

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