The mean number of minutes for app engagement by a tablet user is 8.2 minutes. Suppose the standard deviation is one minute. Take a sample of 60.
1.
What are the mean and standard deviation for the sample mean number of app engagement by a tablet
user?
2. What does the distribution look like?
3. Find the 90 percentile for the sample mean time for app engagement for a tablet user. Interpret this
value in a complete sentence.