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?

Question

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?