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A quality control manager at a factory s...

A quality control manager at a factory selects 7 lightbulbs at random for inspection out of every 400 lightbulbs produced. At this rate, how many lightbulbs will be inspected if the factory produces 20,000 lightbulbs?

A

300

B

350

C

400

D

450

Text Solution

Verified by Experts

Choice B is correct. The quality control manager selects 7 lightbulbs at random for inspection out of every 400 lightbulbs produced. A quantity of 20,000 lightbulbs is equal to `(20,000)/(400)=50` batches of 400 lightbulbs. Therefore, at the rate of 7 lightbulbs per 400 lightbulbs produced, the quality control manager will inspect a total of `50 xx 7 = 350` lightbulbs.
Choices A, C, and D are incorrect and may result from calculation errors or misunderstanding of the proportional relationship.
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