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Company XYZ know that replacement times for the quartz time pieces it produces are normally distributed with a mean of 16.4 years and a standard

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Company XYZ know that replacement times for the quartz time pieces it produces are normally distributed with a mean of 16.4 years and a standard deviation of 2.1 years.Find the probability that a randomly selected quartz time piece will have a replacement time less than 12.4 years?P(X

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