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Originally Posted by BusterPorn
How do you figure that?
3 parcels of land, 60%, 20% and 20% making the overall probability of finding oil 33.33% (60+20+20/3=33.33) or you could be philosophical about it and say that since there is 60% oil in finding oil in the 1st parcel then the overall chances of finding oil are still 60%.
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Probabily of finding no oil is 20%, so P(finding oil) = 1-P(not finding oil) so 80%
for B, use P(A|B)=P(AB)/P(B) or maybe Bayes' Theorem... don't feel like thinking...