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smith is a weird inspector at a shipyard. he knows for keeping track of good and...

smith is a weird inspector at a shipyard. he knows for keeping track of good and standard welds that for the afternoon shift 5% of all welds done will be standard. If smith checks 300 of the 7500 welds completed that shift, what is the probability that he will find between 10 and 20 substandard welds

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