# Question

According to e-Marketer, adults in the United States average 82 minutes per day on mobile devices in 2012. Assume that minutes per day on mobile devices follow the normal distribution and has a standard deviation of 27 minutes.

a. What is the probability that the amount of time spent today on mobile devices by a particular U. S. adult is

1. less than 70 minutes?

2. more than 65 minutes?

3. between 85 and 110 minutes?

b. Confirm the answers to part a using Excel or PHStat.

c. Which number of minutes per day represents the 75th percentile?

a. What is the probability that the amount of time spent today on mobile devices by a particular U. S. adult is

1. less than 70 minutes?

2. more than 65 minutes?

3. between 85 and 110 minutes?

b. Confirm the answers to part a using Excel or PHStat.

c. Which number of minutes per day represents the 75th percentile?

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