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Let X1, ..., Xn be i.i.d. sampled from a population. If for n = 36, the corresponding sample average X is a random variable with

Let X1, ..., Xn be i.i.d. sampled from a population. If for n = 36, the corresponding sample average X is a random variable with standard deviation 2. Then how large must the sample size n become if the standard deviation is to be reduced to 1.2?

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