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A company installs 5,000 light bulbs, each with an average life of 500 hours, standard deviation of 100 hours, and distribution approximated by a...

A company installs 5,000 light bulbs, each with an average life of 500 hours, standard deviation of 100 hours, and distribution approximated by a normal curve. How would I Find the approximate number of bulbs that can be expected to last the period of time.Between 540 hours and 780 hours.

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