'Some' is meant for four or more. 'Couple' is meant for two.
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They are used to test hypothesis such as the mean is some value where you do not know if otherwise the mean is less or more.
Assuming you mean sum and not some, the answer is No.
No, the geometric mean is not the same as the mean of two numbers.
Some triangles can be classified by only term, and some triangles fall into two overlapping, non-mutually-exclusive categories.
The mean is another word for their average. Total them and divide by two.