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7. An oil prospector will drill a succession of holes in a given area to find a productive well. The probability she is successful on

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7. An oil prospector will drill a succession of holes in a given area to find a productive well. The probability she is successful on a given trial is 0.3. b) What is the probability that the tenth hole drilled yields the fourth productive well? c) How many holes would be expected to be drilled before finding the first productive well? d) If ten holes are drilled, what is the probability of exactly 4 productive wells

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