The following table summarizes the ages of the 400 richest Americans. Suppose we select one of these individuals. Find the probability that the selected individual is at least 60 years old. 
Definitions:
Previous Point
In drawing or conceptualization, refers to a selected location or node used as a reference for subsequent actions or measurements.
Dimensioning
The practice of specifying part sizes, shapes, and features on technical drawings or CAD models, including dimensions, tolerances, and other critical specifications.
Two-Axis
Referring to systems, machines, or components that operate or move in two different directions or planes, typically described by x and y coordinates.
Negative Y Values
Represent values below the horizontal axis in a Cartesian coordinate system, typically indicating a decrease or loss.
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