According to a marketing​ website, adults in a certain countryaverage 5454 minutes per day on mobile devices this year. Assumethat minutes per day on mobile devices follow the normaldistribution and has a standard deviation of 1212 minutes. Completeparts a through d below.
A. What is the probability that the amount of time spent todayon mobile devices by an adult is less than 63 ​minutes?
(Round to four decimal places as​ needed.)
B. What is the probability that the amount of time spent todayon mobile devices by an adult is more than 42 ​minutes?
(Round to four decimal places as​ needed.)
C. What is the probability that the amount of time spent todayon mobile devices by an adult is between 32 and 49 minutes?
(Round to four decimal places as​ needed.)
D. What amount of time spent today on mobile devices by an adultrepresents the 85th ​percentile?
​(Round to two decimal places as​ needed.)
