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OpenStudy (anonymous):
A&X Electrical makes a lamp. The Research department found that the life of the lamp is normally distributed with a mean of 5000 hours and a standard deviation of 450 hours. 6. BB Enterprises places a special order from A&X Electrical for 1000 lamps. If their contract states that A&X Electrical will replace all lamps that fail before 4000 hours. How many lamps should A&X Electrical expect to replace?
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