Value Watt lightbulbs have an average lifetime of 730 hr of use before burning out, with a standard deviation of 40 hr, according to the quality control department. Assume these times are normally distributed.What percent of bulbs will burn out before being used 690 hr? Round your answer to one decimal place.__________ %

Fill in the blank(s) with the appropriate word(s).


15.9

Computer Science & Information Technology

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Computer Science & Information Technology