Engines manufactured on an assembly line


Assume 10% of the engines manufactured on an assembly line are defective. If engines are randomly selected one at a time and tested. What is the probability that the third nondefective engine will be found

a) on the fifth trial?

b) on or before the fifth trial?

Please show all steps. I believe negative binomial is at work here.

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Basic Statistics: Engines manufactured on an assembly line
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