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Mathematics 7 Online
OpenStudy (anonymous):

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 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%

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