Question: Consider a population with 3 observations: 6, 10 and 12. You use simple random sampling without replacement to select a sample of 2 observations. What

Consider a population with 3 observations: 6, 10 and 12. You use simple random sampling without replacement to select a sample of 2 observations.

What is the standard deviation of the sample mean and what is the probability that the sample mean is 9 or larger?

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