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One study was conducted to determine whether the average age of a mobile phone is normally...

One study was conducted to determine whether the average age of a mobile phone is normally distributed with an estimated 5-year average population and a standard deviation of 1.4 years. If a random sample of 18 cellphones is taken.
a. Determine the average age of mobile phones more than 5 years 6 months. b. Determine the average age of the mobile phone between 5.5 to 6 years.

math   Statistics-And-Probability   
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