Question: Smith is a weld inspector at a shipyard. He knows from keeping of good and substandard welds that for the afternoon shift 5% of all

Smith is a weld inspector at a shipyard. He knows from keeping of good and substandard welds that for the afternoon shift 5% of all welds done will be substandard. If smith checks 300 of the 7500 welds completed that shift, what is the probability that he will find less than 20 substandard welds?

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