Question 665554
 Suppose the monthly charge for cell phone plans is normally distributed with a mean of $62 and a standard deviation of $18.
1. What percent of the cell plans would be above two standard deviations above the mean? 
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Note: That percent does not depend on the value of the mean or the value
of the standard deviation.  It is always the percent of the distribution
above z = 2
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P(z > 2) = normalcdf(2,100) = 0.0228
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Cheers,
Stan H.
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