Variables are simply used as a connection to the real world, a variable may represent a number you have to find and you can use an equation to do so.
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It might help if you specified why WHAT was important in random variables.
to quantify the qualitative variables.
They use them to solve an equation they don't know.Accountants use variables to give a visualization to their customers as to how they are doing the accounting
Because they allow you to generalise results. Then, for specific value of the variables you get specific answers.
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