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Statistics - Probability

Control A certain machine that is used to manufacture screws produces a defect rate of .01. A random sample of 20 screws is selected. Find the probabilities that the sample contains the following.

Exactly 4 defective screws

No more than 4 defective screws

Solution Preview

Mean (Expected number of defects) = m = n * p = 20 * 0.01 = 0.2, p = 0.01, q = 1 - p = ...

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