Full-time college students report spending a mean of 25 hours
per week on academic activities, both inside and outside the
classroom. Assume the standard deviation of time spent on academic
activities is 4 hours. Complete parts (a) through (c) below. A.
If you select a random sample of 25 full-time college students,
what is the probability that the mean time spent on academic
activities is at least 23 hours per week?