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Most probably not. But it should be close to the population mean if various conditions are met:
For example, the population should consist of independent, [nearly] identically distributed variables, the sample is not systematically biased (it does not have to be completely random).
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Why is the sample mean an unbiased estimator of the population mean?
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.
True or false a distribution of sample means is normally distributed with a mean equal to the population mean and standard deviation equal to the standard error of the mean?
True.
What is population mean in statistics?
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.
What happens to the sample mean as the sample size increases?
With a good sample, the sample mean gets closer to the population mean.
What does it mean for a sample to representative of a population?
That the key characteristics of the population are reflected in the sample.
