D. 5 Percent Of All​ 18- To​ 24-Year-Olds Will Spend Less Than How Many Minutes Watching Video On His Or Her Smartphone Per​…

d. 5 percent of all​ 18- to​ 24-year-olds will spend less than how many minutes watching video on his or her smartphone per​ month?

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A study indicates that 18- to 24- year olds spend a mean of 115 minutes watching video on their smartphones per month. Assume that the amount of time watching video on a smartphone per month is normally distributed and that the standard deviation is 15 minutes. Complete parts (a) through (d) below. a. What is the probability that an 18- to 24-year-old spends less than 95 minutes watching video on his or her smartphone per month? The probability that an 18- to 24-year-old spends less than 95 minutes watching video on his or her smartphone per month is .0918 (Round to four decimal places as needed.) b. What is the probability that an 18- to 24-year-old spends between 95 and 125 minutes watching video on his or her smartphone per month? The probability that an 18- to 24-year-old spends between 95 and 125 minutes watching video on his or her smartphone per month is 0.6563. (Round to four decimal places as needed.) c. What is the probability that an 18- to 24-year-old spends more than 125 minutes watching video on his or her smartphone per month? The probability that an 18- to 24-year-old spends more than 125 minutes watching video on his or her smartphone per month is (Round to four decimal places as needed.)

Expert's Answer

a)  Let's assume that the random variable X corresponds to time spent in minutes by an 18-24 year old selected at random from the city mentioned in the problem. We therefore want to calculate P(X …

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