Question: In sampling distribution, what does x bar mean? Is it: 1) mean of a SRS drawn from the population, or 2) mean of the sum

In sampling distribution, what does x bar mean? Is it: 1) mean of a SRS drawn from the population, or

2) mean of the sum of all SRS values ,or 3)mean of the means of all SRS, or 4) any better explanation?

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