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Question: A company installs 5000 light bulbs, each with an average life of 500 hours, standard deviation of 100 hours, & distribution approximated by a normal curve. What is the approximate number of bulbs that can be expected to last the specified period of time?

Less than 690 hours.

[A] 2357

[B] 4853

[C] 4857

[D] 4860

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