A college professor collected data on the number of hours spent by his 100 students over the weekend to prepare for Monday's Business Statistics exam.He processed the data by Excel and the following incomplete output is available. 
The coefficient of variation in the data is ______.
Definitions:
Constructive Thought Patterns
Cognitive processes that are positive, productive, and conducive to finding solutions and fostering personal growth.
Self-talk
The internal dialogue that individuals engage in, which can influence one's emotions, behavior, and overall mental health.
Mental Imagery
The representation of sensory information in the mind without external input, often involving visualizing scenarios or rehearsing actions.
Natural Rewards
Benefits that spontaneously arise from performing certain activities, providing inherent satisfaction or pleasure.
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