The graph below is an ogive of scores on a math test. The vertical axis in an ogive is the cumulative relativefrequency and can also be interpreted as a percentile. 
Use the graph to approximate the percentile rank of an individual whose test score is 60.
Definitions:
Afferent
Describes nerves or vessels that carry signals toward a central structure or the brain.
Precursors
Precursors are substances, cells, or chemical compounds that precede and are the origin or source of another substance or biological entity.
Plasma Cells
A type of white blood cell that produces antibodies in response to infections.
Lymphocytes
A type of white blood cell central to the immune system, responsible for antibody production and other defense mechanisms against infection and disease.
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