Suppose that X1 is an estimate of a parameter with a standard deviation 5.39, and that

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Suppose that X1 is an estimate of a parameter θ with a standard deviation 5.39, and that X2 is an estimate of θ with a standard deviation 9.43. If the estimates X1 and X2 are independent, what is the standard deviation of the estimate (X1 + X2)/2?
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