In statistics the parameters of the distributions of populations are the fundamental values of interest. In a way the randomness just gets in the way of learning about the parameters. They are considered constant because they define or characterise the distributions of populations.
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It should not be said to be a constant.
a quantity or parameter that does not change its value whatever the value of the variables, under a given set of conditions.
Parameter
It is not!
Put their names into the parameter-list.