A company installs 5000 light bulbs, each with an average life of 500 hours, standard deviation of 100 hours, and distribution a

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A company installs 5000 light bulbs, each with an average life of 500 hours, standard deviation of 100 hours, and distribution a

pproximated by a normal curve. Find the percentage of bulbs that can be expected to last the period of time.Less than 690 hours. . A. 97.06%. . B. 47.14%. . C. 97.1%. . D. 97.2%

Mathematics

1 answer:

andrey2020 [161] · Answer 1 · 2022-02-01T12:10:56+03:00

The company installs 5000 light bulbs with an average of 500 hours for each bulb. The standard deviation of 100 hours and distribution approximated by a normal curve. The percentage of bulbs that can be expected to last the period of time of less than 690 hours is 97.1%. This will make the answer to be C.