SOLUTION: If P(A)=0.5 and P(B)=0.25 and P(A intersection sign B)= 0.07 Find P(B/A') thanks

Question 188433: If P(A)=0.5 and P(B)=0.25 and P(A intersection sign B)= 0.07
Find P(B/A')
thanks

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
If P(A)=0.5 and P(B)=0.25 and P(A intersection sign B)= 0.07
Find P(B/A')
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P(B|A') = P(B and A')/P(A')
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One way to do this:
1st: draw a venn diagram with two intersecting circles, A and B.
Label A with 50 and B with 25 and (A intersection B) with 7
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Then there are 50+25-7 = 68 is the number in AUB.
Then 32 is the number in (AUB)'.
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So, P(B and A') = 18/100 and P(A') 50/100
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Ans: P(B|A') = 18/50 = 9/25
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Cheers,
Stan H.

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