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The population mean is the mean value of the entire population. Contrast this with sample mean, which is the mean value of a sample of the population.
The sample mean is an unbiased estimator of the population mean because the average of all the possible sample means of size n is equal to the population mean.
With a good sample, the sample mean gets closer to the population mean.
That the key characteristics of the population are reflected in the sample.
The variance decreases with a larger sample so that the sample mean is likely to be closer to the population mean.