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A Company Installs 5000 Light Bulbs, Each with an Average

Question 47

Multiple Choice

A company installs 5000 light bulbs, each with an average life of 500 hours, standard deviation of 100 hours, anddistribution approximated by a normal curve. Find the approximate number of bulbs that can be expected to last thespecified period of time.
-Less than 690 hours


A) 4860
B) 4857
C) 4853
D) 2357

Correct Answer:

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