The average burning times of American Standard lightbulbs (made in China) are normally distributed, with a mean of 1,000 hr and a standard deviation of 100 hr, according to quality control studies. A company installs a large number of these bulbs at the same time. After what amount of time should we expect 91% of them to fail? Please round the answer to the nearest hour.
A. 
hr
B. 
hr
C. 
hr
D. 
hr
E. 
hr
Answer: E
Computer Science & Information Technology
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