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Company XYZ know that replacement times for the quartz time pieces it produces are normally distributed...

Company XYZ know that replacement times for the quartz time pieces it produces are normally distributed with a mean of 10.8 years and a standard deviation of 0.9 years.

Find the probability that a randomly selected quartz time piece will have a replacement time less than 8.6 years?
P(X < 8.6 years) =

Enter your answer accurate to 4 decimal places. Answers obtained using exact z-scores or z-scores rounded to 3 decimal places are accepted.

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