Value Watt lightbulbs have an average lifetime of 720 hours of use before burning out, with a standard deviation of 90 hours, according to the quality control department. Assume these times are normally distributed. What percent of bulbs will last between 720 and 810 hours?
A. 47.5%
B. 34.1%
C. 15.9%
D. 50.0%
E. 13.5%
Answer: B
Computer Science & Information Technology
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