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13 March, 09:27

From a shipment of 350 light-bulbs, a sample of 70 was selected at random and tested. If 21 light-bulbs in the sample were found to be defective, how many defective light-bulbs would be expected in the entire shipment?

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  1. 13 March, 09:29
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    The answer is 105 because you have to set it up in a proportion
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