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A geological study indicates that an explatory oil well should strike oil with probability 0.2. i)...

A geological study indicates that an explatory oil well should strike oil with probability 0.2.
i) find the probability that the 3rd strike comes on the 9th well drilled
ii) find the mean of the number of wells that must be drilled if the company wants to setup the third producing wells.
Math   Statistics-And-Probability   
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