Ok, I'm in a good mood.
First off your first answer is wrong.
Quote:
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a. What is the probability of finding oil?(I know the answer, 0.80)
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It's not 0.80, you don't just add the first 2 probabilities and ignore the second set of data given. You need to multiply the 2 probabilities and then sum them up:
So, (0.60 * 0.20) + (0.20 * 0.80) + (0.20 * 0.20) = .12 + .16 + 0.4 = 0.68
So you actually have a 68% chance of discovering oil now.
PS: It's been 2 years since I did stats, so don't hold me to this answer. If you fail, its your own fault for not paying attention in class.
WG