A type of earphone which has a central earphone transducer coupled to both ears by acoustic tubes in a Y-formation like that of a traditional stethoscope. The word may have been a registered trademark in UK at one time, but it appears not to be now. The mark owner may well be no longer in business.
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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.