Answer:
The standard deviation of the sample mean is
Step-by-step explanation:
From the question we are told that
The mean is
The standard deviation is
The sample size is
Generally the standard deviation of the sample mean is mathematically represented as
substituting values
Answer: 68x420=
28,560
Step-by-step explanation:
No explanation. PAY ATTENTION TO YOUR TEACHER
I think the answer is D.
If not juts look up a linear equation calculator and it will tell you.
Hope this helps :)