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OpenStudy (anonymous):
Out of 1,100 discs tested,13 are defective.EStimate the number of defective discs in a batch of 41,000
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OpenStudy (anonymous):
well i would divide 41,000 by 1,100 then multiply that by 13
OpenStudy (anonymous):
(13/1100) = (x/41000) 533000 = 1100x divide both sides by 1100
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