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29 November, 03:45

A quality control inspector examined 240 calculator and found 13 of them to be defective at this rate how many defective calculator will there be in a batch of 13 200

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  1. 29 November, 04:09
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    13200 = 55 x 240

    If for 240, 13 calculators are bad;

    For 13200, (13*55) calculators will be bad.

    ->715 calculators will be bad, from a sample of 13200.
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