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A manufacturer fills an order for 4,200 smart phones. The quality inspector selects a random of 60 phones and finds that 4 are defective. How many smart phones in the order are likely to be defective?

Respuesta :

The answer (i think) would be 210.

Because

4200 / 60 = 70

4 / 70 = .05

4200 x .05 = 210

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