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Mathematics 13 Online
OpenStudy (anonymous):

9. From a shipment of 400 light-bulbs, a sample of 80 was selected at random and tested. If 32 light-bulbs in the sample were found to be defective, how many defective light-bulbs would be expected in the entire shipment? A 200 B 128 C 160 D 192

OpenStudy (anonymous):

Proportion |dw:1327414049485:dw| cross multiply 80x = 12800 divide by 80 x = 160 which is C

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