The replacement times for cell phones are normally distributed with mean 3.1 years and standard...

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The replacement times for cell phones are normally distributed with mean 3.1 years and standard deviation 0.8 years. What length of time separates the top 5% of cell phone replacements from the rest?The replacement time cut-off for the top 5% is11.1 years3.2 years4.7 years4.4 years5.2 years

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