Automobiles traveling on a road with a posted speed limit of 65 miles per hour are checked for speed by a state police radar system.The following is a frequency distribution of speeds. 
The standard deviation of this distribution is closest to:
Definitions:
Nervous System
is the network of nerve cells and fibers that transmits nerve impulses between parts of the body, coordinating its actions and sensory information.
Central Nervous System
The part of the nervous system that consists of the brain and spinal cord, responsible for processing and transmitting information in the body.
Peripheral Nervous System
The section of the nervous system lying outside the brain and spinal cord, which includes nerves that connect the central nervous system to sensory organs, muscles, and glands.
Fetal Nerve Cell Transplants
A medical procedure that involves transplanting nerve cells from a fetus into the brain or spinal cord of a patient to treat neurological disorders.
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