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
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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?
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z(1100) = (1100-1000)/80 = 100/80 = 1.2500
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P(x > 1100) = P(z > 1.2500) = 0.1057
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Cheers,
Stan H.
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