Posted by alex on Sunday, September 18, 2011 at 5:22pm.
From a shipment of 350 lightbulbs, a sample of 70 was selected at random and tested. If 21 lightbulbs in the sample were found to be defective, how many defective lightbulbs would be expected in the entire shipment?

algebra 1  Audrey, Sunday, September 18, 2011 at 5:24pm
since you're sampling a fifth of the lightbulbs, then you would times 21 and 5 to get 105 defective lightbulbs

algebra 1  Anonymous, Sunday, September 18, 2011 at 8:25pm
Since 70 bulbs is 1/5 of all the lightbulbs,then 21*5=105 will be defective.
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