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Probability value based on normal distribution.

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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 approximated by a normal curve. Find the approximate number of bulbs that can be expected to last the specified period of time.

Less than 690 hours.

A) 4857

B) 4860

C) 2357

D) 4853

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