the standard deviation is defined as the square root of the variance, If the variance is 25 the the sd=5
Jim
Steve W.
asked • 06/13/14independent and identically distributed random variables
X_1,X_2,… X_121 are independent and identically distributed random variables such that E(X_i )=3 and Var
(X_i )=25. What is the standard deviation of their average? In other words, what is the standard deviation of (X_1+X_2+ …+X_121)/121?
Follow
•
2
Add comment
More
Report
1 Expert Answer
Still looking for help? Get the right answer, fast.
Ask a question for free
Get a free answer to a quick problem.
Most questions answered within 4 hours.
OR
Find an Online Tutor Now
Choose an expert and meet online. No packages or subscriptions, pay only for the time you need.
