Jim S. answered • 06/13/14
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Physics (and math) are fun, really
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?
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