Chapter 7: Q. 7.7 (page 408)
7.7 The mean number of minutes for app engagement by a table use is minutes. Suppose the standard deviation is one minute. Take a sample size of .
a. What is the probability that the sum of the sample is between seven hours and ten hours? What does this mean in context of the problem?
b. Find the and percentiles for the sum of the sample. Interpret these values in context.
Short Answer
(a) The probability that the sum of the sample between seven hours and ten hours is
(b) The and percentiles for the sum of the samples are respectively