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?

Question

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 B

Reiny · Answer

I got .1587, which matches 16% or D Did you take 1 - ...., since it asked for "above" ?

PsyDAG · Answer

Disagree. "More than" includes everything below the mean.

PsyDAG · Answer

Agree.

angela · Answer

PsyDag do you agree with Reiny or the answer i have

PsyDAG · Answer

I misread the Question, so your answer