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Answer to Question #43332 in Statistics and Probability for andy

Question #43332
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 = (X_1 + X_2 + … + X_121) / 121?
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