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2 October, 21:27

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?

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  1. 2 October, 21:32
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    80 x 5 = 400

    32 x 5 = 160

    so you have about 160 defective bulbs
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