A random sample X 1 , X 2 , X 3 , . . ., X 100

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A random sample X1, X2, X3, . . ., X100 is given from a distribution with known variance Var(Xi) = 81. For the observed sample, the sample mean is X̅ = 50.1. Find an approximate 95% confidence interval for θ = EXi

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