"Floorboards" are tongue and grooved wooden planks that are used to make wooden floors.
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Convert everything to meters - i.e., 20 cm. = 0.2 meters. Do the multiplication to get the area (a) of each floorboard, (b) of the entire room, then compare (divide).
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".