Standard error (SE)

Or

Therefore, SE of the mean = (8)/(2) =4
The answer to your question is D) √5x/5x.
I hoped this helped!
Question 5- is 9
question 6- is 9
question 7-is 4
question 8-is 21
Question 9-is 2
question 10-not sure sorry :(
Tell me if your right ;)