Mean of 158 and a standard deviation of 21. Find the mean and standard error of the mean of this sampling distribution when using random samples of size 5

Question

Normally distributed. Answer choices are A. 158, 5

B. 158, 21

C. 158, 9.39

D. 158, 4.2

Answer 1

from what  i  remember standard error is calculated by dividing the standard deviation by the √ of the sample size..