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According to a marketing​ website, adults in a certain country average 5454 minutes per day on...

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Statistics

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.)

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