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.

1. Determine the z-score for a lamp that lasts 4000 hours.

2. What is the probability a lamp will last more than 4000 hours?

3. How many hours correspond to a z-score of 1.645?

4. What is the probability a Lamp will last more than 5000 hours?
.

5. A&X electrical wants to place a warrantee, so that no more than 5% fail during the warrantee period. How many hours should

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.

1. Determine the z-score for a lamp that lasts 4000 hours.
	




2. What is the probability a lamp will last more than 4000 hours?






3. How many hours correspond to a z-score of 1.645?
	





4. What is the probability a Lamp will last more than 5000 hours?
	.




5. A&X electrical wants to place a warrantee, so that no more than 5% fail during the warrantee period.  How many hours should

anonymous · Answer

i really just need 5.