Solve the problem.
-A final exam in Math 160 has a mean of 73 with standard deviation 7.8. If 24 students are randomly selected, find the probability that the mean of their test scores is greater than 78.
A) 0.0036
B) 0.0103
C) 0.0008
D) 0.8962

Question

Quizplus · Accepted Answer

The sampling distribution of the sample mean will have a mean of 73 and a standard deviation of 7.8/sqrt(24). Using the standard normal distribution, calculate the z-score for a sample mean of 78 and find the probability that the sample mean is greater than 78.

Solve the Problem. -A Final Exam in Math 160 Has a Mean of a Mean