SOLUTION: A manufacturer of halogen light bulbs claims that the lives of the light bulbs are normally distributed with the average life of 900 hours and SD of 50 hours. find the probability
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Question 756421: A manufacturer of halogen light bulbs claims that the lives of the light bulbs are normally distributed with the average life of 900 hours and SD of 50 hours. find the probability that a randomly selected light bulb will last for more than 810 hours? Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! A manufacturer of halogen light bulbs claims that the lives of the light bulbs are normally distributed with the average life of 900 hours and SD of 50 hours. find the probability that a randomly selected light bulb will last for more than 810 hours?
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z(810) = (810-900)/50 = -90/50 = -9/5
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P(x > 810) = P(z > -9/5) = normalcdf(-9/5,100) = 0.9641
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Cheers,
Stan H.
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