According to e-Marketer, adults in the United States average 82 minutes per day on mobile devices in

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?

Distribution
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