The mean is synonymous with the average, the sum of the numbers divided by the quantity of the numbers. For example, the average or mean of 2, 4 and 9 is 5, because (2 + 4 + 9) ÷ 3 = 5.
I am not familiar with the term domain being a property of a set of constants. I understand a domain to be a property of a mathematical function; specifically, the domain of a function is the set of all possible inputs to the function that yield real individual outputs. For example, if a function of x is 4 ÷ (x - 2), the domain of x is any real number other than 2, since 2 would cause division by zero, so the output would not be a real number.
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By definition, it is the set of all real numbers!
domain = set R ,, all real numbers
The domain can be any subset of the set of all numbers.
It is the domain of the expression.
The set of all real numbers. Or all complex numbers, depending what you decide to use as your basic set.