Probability to not buy again from same manufacturer

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Reference no: EM13124609

A manufacturer of light bulbs says that its light bulbs have a mean life of 800 hours and a standard deviation of 120 hours. You purchased 169 of these bulbs with the idea that you would purchase more if the mean life of your sample were more than 780 hours. What is the probability that you will not buy again from this manufacturer?

Reference no: EM13124609

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