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Ya but see
[What is the probability of a positive soil test?
P(+)=P(+ | high quality oil)* P(high quality oil)+P(+ | medium quality oil)* P(medium quality oil)+P(+ | no oil)* P(no oil)=0.32]
Im not looking for the PROBABILITY of a positive SOIL TEST...
Thats what you/they calculated.
Question says probability of finding oil.. So how can you include the probability of finding no oil into the calculation
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