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A factory produces components of which 1% are defective. The components are packed in boxes of...

A factory produces components of which 1% are defective. The components are packed in boxes of 10. A box is selected by random.

a) Find the probability that there are at most 2 defective components in the box.  

b) Use a suitable approximation to find the probability of having at most 3 defective (inclusive 3 cases) components out of 250.

Math   Statistics-And-Probability   
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