According to eMarketer, adults in the United States spent an average of 92 minutes per day on

Question:

According to eMarketer, adults in the United States spent an average of 92 minutes per day on social media platforms Facebook, Snapchat, and Instagram in 2017. Assume that minutes per day on these platforms follow a normal distribution with 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.

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

Distribution
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