Decision Models., Advanced Statistics, Advanced Statistics

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An oil company thinks that there is a 60% chance that there is oil in the land they own. Before drilling they run a soil test. When there is oil in the ground, the soil test comes back positive(indicating oil) 90% of the time. When there is NO oil in teh ground, the soil test is positive(indicating oil) 20% of the time.
What is the probability that a test comes back positive-indicating oil. What is the probability that there is oil in the ground, if the test comes back positive?

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