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.
3. How many hours correspond to a z-score of 1.645?
use x=z(sd)+mu?

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.
3.	How many hours correspond to a z-score of 1.645?
use x=z(sd)+mu?

anonymous · Answer

1.645(450)+5000 is a number that is really high...

ganeshie8 · Answer

not so much hight compared to ur mean of 5000 hours

anonymous · Answer

oh i must have been doing something wrong

anonymous · Answer

got it thanks

ganeshie8 · Answer

http://www.wolframalpha.com/input/?i=1.645%28450%29%2B5000