A store received a shipment of 500 laptops, 3 of which were defective. If a laptop is randomly selected from this shipment, what is the probability that it is defective?

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We can set a simple proportion to find the probability:

$$ \frac{3\text{ defective}}{500\text{ total laptop}}=\frac{x \text{ defective}}{1 \text{ laptop}} $$ $$ x=\frac{3}{500} $$ $$x=0.006 $$