Use the Following Information for Questions:
Assume the Cholesterol $\mu$

Multiple Choice

Use the following information for questions:
Assume the cholesterol level in a certain population has mean $\mu$ = 200 and standard deviation $\sigma$ = 24. The cholesterol levels for a random sample of n = 9 individuals are measured and the sample mean $\overline{x}$ is determined.
-What is the z-score for a sample mean $\overline{x}$ = 220?

A) -3.75
B) -2.50
C) 0.833
D) 2.50