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Probability that you will not buy again from manufacture

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Reference no: EM132193006

A manufacturer of light bulbs claims that it's light bulbs have a mean life of 693 hours and a standard deviation of 117 hours. You purchased 144 of these bulbs and decided that you would purchase more if the mean life of your current sample exceeded 685 hours. What is the probability that you will not buy again from this manufacturer? (Give your answer correct to four decimal places.)

Reference no: EM132193006

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