This is the following definition of postmark:
An official mark stamped on a letter or other postal package, giving the place, date, and time of posting, and serving to cancel the postage stamp.
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No, but sometimes "average" means "mean" - when it doesn't mean median, geometric mean, or something else entirely.
The answer will depend on who you mean by HE.The answer will depend on who you mean by HE.The answer will depend on who you mean by HE.The answer will depend on who you mean by HE.
See mean-8. Or get a dictionary.
There is no statistical term such as "deviation mean".
No, the geometric mean is not the same as the mean of two numbers.