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Asked Feb 21, 2020
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A plate is attached to its base by 10 bolts. Each bolt is inspected before installation, and the probability of passing the inspection is 0.9. Only bolts that pass the inspection are installed. Let X denote the number of bolts that are inspected in order to attach one plate. a) Find P(X = 12). b) Find μX. c) Find σX.

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