A probability density function.
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That would be a number line.
The one that shows 3 and 3/4 or 15/4
open circle menas it is not part of the solution set and closed circle means that it is part of the solution
The number can be equal to minus, zero or plus when plotted on the number line and two numbers plotted on the number line can have a range of numerical values.
the purpose of a number line is to help math.