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The objects within a number set can be caled as "Elements" or "members".
Count the number of elements in the set - call this number n. Add up all the numbers in the set - call this total t Then mean = t/n
The number of subjects will depend on what the elements of the set are. The number of subsets is 2a.
The answer depends on what "200" refers to. A null set has no elements, but then it is strange to call it 200!
If a set has "n" elements, then it will have 2n subsets. This number of subsets is always larger than the number of elements - whether the set is finite or infinite.