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)
