Mathematics, 05.08.2019 17:30 zahradawkins2007
Amajor cell phone service provider has determined that the number of minutes per month that its customers use their phone is normally distributed with mean equal to 445.5 minutes and standard deviation equal to 22.75 minutes. the company is thinking of charging a lower rate for customers who use the phone the most. if it wishes to give the rate reduction to no more than 9 percent of its customers, what should the cut-off be?
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