Suppose that the amount of time per day that American adults spend on their mobile devices is normally distributed with mean 229 minutes and standard deviation 57 minutes.   What percentage of American adults spend between 120 and 180 minutes on their mobile devices per day? What percentage of American adults spend less than 60 minutes on their mobile devices per day?

MATLAB: An Introduction with Applications
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Suppose that the amount of time per day that American adults spend on their mobile devices is normally distributed with mean 229 minutes and standard deviation 57 minutes.

 

What percentage of American adults spend between 120 and 180 minutes on their mobile devices per day?

What percentage of American adults spend less than 60 minutes on their mobile devices per day?

 

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