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A math scale is a set of numbers or amounts used to measure or compare the level of something .
the set of possible values of the independent variable or variables of a function.
If in a data set, each data point is only used once, then there is no mode.
'A' is being used as the name of some set in a problem or example. 'Set' is the term for a group of numbers with some characteristic, maybe the answer to a problem, maybe just a description (like the set of even numbers).
It is used in set theory to indicate intersection. The intersection of two sets, A and B, is the set of all elements that are in A as well as in B.