SOLUTION: a manufacturer of light bulbs claims that its new light bulb has a mean life of 1000 hours with a standard deviation of 80 hours. Assume the lifetimes of the bulbs are normally dis
Algebra ->
Probability-and-statistics
-> SOLUTION: a manufacturer of light bulbs claims that its new light bulb has a mean life of 1000 hours with a standard deviation of 80 hours. Assume the lifetimes of the bulbs are normally dis
Log On
Question 364272: a manufacturer of light bulbs claims that its new light bulb has a mean life of 1000 hours with a standard deviation of 80 hours. Assume the lifetimes of the bulbs are normally distributed. What is the probability that a randomly chosen bulb will last more than 1100 hours? Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! a manufacturer of light bulbs claims that its new light bulb has a mean life of 1000 hours with a standard deviation of 80 hours. Assume the lifetimes of the bulbs are normally distributed. What is the probability that a randomly chosen bulb will last more than 1100 hours?
-----------
z(1100) = (1100-1000)/80 = 100/80 = 1.2500
-------
P(x > 1100) = P(z > 1.2500) = 0.1057
==============
Cheers,
Stan H.
==============
(