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7.9 According to a report by App Annie, a business intelligence company that produces tools and reports for the apps and digital goods industry, smartphone
7.9According to a report by App Annie, a business intelligence company that produces tools and reports for the apps and digital goods industry, smartphone owners are using an average of 30 apps per month.
Source: "Report: Smartphone owners are using 9 apps per day, 30 per month," 2017, tcrn.ch/2qK4iRr.
Assume that number of apps used per month by smartphone owners is normally distributed and that the standard deviation is 5. If you select a random sample of 25 smartphone owners,
- What is the probability that the sample mean is between 29 and 31?
- What is the probability that the sample mean is between 28 and 32?
- If you select a random sample of 100 smartphone owners, what is the probability that the sample mean is between 29 and 31?
- Explain the difference in the results of (a) and (c).
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