SOLUTION: If light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviation of 500 hours, approximately what percentage of light bulbs has a life of

Question 1033184: If light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviation of 500 hours, approximately what percentage of light bulbs has a life of more than 3000 hours?
A. About 84%
B. About 68%
C. About 32%
D. About 16%
Answer by fractalier(6550) (Show Source): You can put this solution on YOUR website!
Since 68% (or so) values fall in between -1 sigma and +1 sigma, that leaves 32% that are outside...that means there are 16% more than 3000 and 16% less than 2000 hours...
Choice D.
RELATED QUESTIONS
If light bulbs have lives that are normally distributed with a mean of 2500 hours and a... (answered by jim_thompson5910)

If light bulbs have lives that are normally distributed with a mean of 2500 hours and a... (answered by jim_thompson5910)

If light bulbs have lives that are normally distributed with a mean of 2500 hours and a... (answered by MathLover1)

If light bulbs have lives tat are normally distributed with a mean f 2500 hours and a... (answered by stanbon)

(1) if light bulbs have lives that are normally distributed with a mean of 2500 hours and (answered by ewatrrr)

If light bulbs have lives that are normally distributed with a mean of 2500 hours and a... (answered by ikleyn)

I would like to see an example for a question. If light bulbs have lives that are... (answered by stanbon)

PLease help, I've posted multiple times but still haven't gotten an answer. A company... (answered by Theo)

. An electrical firm manufactures light bulbs that have a length of life that is normally (answered by stanbon)