A Major Cell Phone Service Provider Has Determined That the Number

question 48

Multiple Choice

A major cell phone service provider has determined that the number of minutes that its customers use their phone per month is normally distributed with a mean equal to 445.5 minutes with a standard deviation equal to 177.8 minutes. The company is thinking of charging a lower rate for customers who use the phone less than a specified amount. If it wishes to give the rate reduction to no more than 12 percent of its customers, what should the cut-off be?

• A) About 237 minutes
• B) About 654 minutes
• C) About 390 minutes
• D) About 325 minutes

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