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Company KY1 know that replacement times for the quartz time pieces it produces are normally distributed with a mean of 15.8 years and a standard

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Company KY1 know that replacement times for the quartz time pieces it produces are normally distributed with a mean of 15.8 years and a standard deviation of 1.? years. Find the probability that a randomly selected quartz time piece will have a replacement time less than 11 years? PILH'

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