Wells Failed 150 2 443 14 26 60 46 Geological Formation Group Total Gneiss 1685 Granite 28 Loch raven schist 3733 Mafic 363 Marble 309 Prettyboy schist 1403 Other schists 933 Serpentine 3 39 Let A denote the event that the geological formation of a well has more than 1000 wells, let B denote the event that a well failed, an let C'denote the event that the geological formation of a well has fewer than 500 wells. (a) What is the probability of a failure given there are more than 1,000 wells in a geological formation? Round your answer to four decimal places (e.g. 98.7654). P(B|A) = (b) What is the probability of a failure given there are fewer than 500 wells in a geological formation? Round your answer to four decimal places (e.g. 98.7654). P(B|C) = ₁

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