Any item that maintains its worth over time.
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An extreme value will drag the mean value towards it.
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.
Negative z value means that the raw dat is below the mean, if z value is positive it means that the raw data is above the mean.
No, it is not.
The mean of a sample is a single value and so its distribution is a single value with probability 1.