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According to a marketing website, adults in a certain country average 53 minutes per day on...

According to a marketing website, adults in a certain country average 53 minutes per day on mobile devices this year. Assume that minutes per day on mobile devices follow the normal distribution and has a standard deviation of 9 minutes.

a. What is the probability that the amount of time spent today on mobile devices by an adult is less than 56 minutes? (Round to four decimal places as needed.)

b. What is the probability that the amount of time spent today on mobile devices by an adult is more the 45 minutes?  ____

c. What amount of time spent today on mobile devices by an adult between 35 and 47 minutes?

d. What amount of time spent on mobile devices today represents the 75th percentile?

Math   Statistics-And-Probability   
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Answer #1

a.

b.

c.

d.

z = 0.674

x = Mean + 0.674*standard dev = 53+0.674*9 = 59.066

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