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 less than 76.
A)0.0301
B)0.8962
C)0.9203
D)0.9699

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, we find the probability that the sample mean is less than 76. This corresponds to a Z-score calculation and looking up the cumulative probability.

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