Finding Probabilities In Exercises 15-18, the population mean and standard
deviation are given. Find the indicated probability and determine whether the
given sample mean would be considered unusual. If convenient, use technology to
find the probability.
15. For a sample of n = 64, find the probability of a sample mean being less than
24.3 when - 24 and 1.25.
16. For a sample of n = 100, find the probability of a sample mean being greater
than 24.3 when μ-24 and = 1.25.
17. For a sample of n = 45, find the probability of a sample mean being greater
than 551 when 550 and
3.7.
-
18. For a sample of n 36, find the probability of a sample mean being less than
12,750 or greater than 12,753 when = 12,750 and
1.7.