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The revised probabilities are now:
Note: P(finding oil) = my answer from part (a) = 0.68
P(high qualith oil) * P ( soil | high quality oil) / P(finding oil) = 0.1765
P(medium quality oil) * P(soil | medium-quality) / P(finding oil) = 0.2353
P(no oil) * P(soil | no oil) / P(finding oil) = 0.0588
WG
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I play with Google.
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