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A Nielsen study indicates that 18-to-34 year olds spend a mean of 93 minutes whatching video...

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Basic Math

A Nielsen study indicates that 18-to-34 year olds spend a meanof 93 minutes whatching video on their smartphones per week. Assumethat the amount of time watching video on a smartphone per week isnormally distributed and that the standard deviation is 15minutes.

1- What is the probability that an 18- to 34 year old spendsless than 77 minutes watching video on his or her smartphone perweek?

2- What is the probability that an 18- to 34- year old spendsbetween 77 minutes and 109 minutes watching video on his or hersmartphone per week?

3- What is the probability that an 18- to 34 year old spendsmore than 109 minutes watching video on his or her smartphone perweek?

4- One percent of all 18- to 34- year olds will spend less thanhow many minutes watching video on his or her smartphone perweek?

(Type it if possible)

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