What is the standard deviation of the returns on a stock given the following information? 
Definitions:
Alertness
The state of being quick to notice and respond to potential dangers or opportunities.
School Start Time
The designated time at which school classes begin for the day, which can significantly impact students' sleep, health, and learning.
Risky Activity
Engagements or behaviors that involve a significant likelihood of suffering harm or loss.
Self-Control
The ability to regulate one's emotions, thoughts, and behaviors in the face of temptations and impulses.
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