In a survey, 26 voters were asked their ages. The results are shown below. Construct a histogram to represent the data (with 5 classes beginning with a lower class limit of 19.5 and a class width of 10). What is the approximate age at the center? 
Definitions:
Water
A ubiquitous chemical substance composed of hydrogen and oxygen, essential for all known forms of life and used in a wide range of industrial processes.
Interstitial Fluid
The fluid that fills the spaces between cells in tissues, serving as a means of transporting nutrients and wastes.
Blood Plasma
The liquid component of blood that carries cells and proteins throughout the body, comprising about 55% of total blood volume.
Cells
The basic structural, functional, and biological units of all living organisms, serving as the building blocks of life.
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