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 approximate number of bulbs that can be expected to last the period of time.More than 400 hours
A. 4200 bulbs
B. 2207 bulbs
C. 4195 bulbs
D. 4219 bulbs
Answer: A
Mathematics
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c = 15, b = 6
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A. 
B. 
C. 
D. 
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