A variable can have lots of different values - as opposed to a constant which has only one. That is why it is called a variable!
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You cannot plug in a variable, what you do is plug in the value for a variable. If you know the value of the variable in an equation (or formula), the process of replacing that variable whenever it appears in the equation by its value is called plugging in the value for the variable.
dependent variable
The probability of a random variable being at or below a certain value is defined as the cumulative distribution function (CDF) of the variable. The CDF gives the probability that the variable takes on a value less than or equal to a given value.
How often the value of a random variable is at or below a certain value.
the variable age has discriptive value but not necessarily explanatory value.