Consider the following historic set of returns for TKY Ltd stock: 
What is the standard deviation of the returns on TKY Ltd?
Definitions:
Cognitive Changes
Alterations in thinking, memory, problem-solving, and other mental abilities that may occur due to various factors like aging, illness, or environmental changes.
Self-focused Thinking
An introspective mode of thinking wherein an individual's attention is predominantly centered upon themselves, their feelings, and their thoughts.
Negative Outcomes
Unfavorable results or consequences of an action or situation that are harmful or undesirable.
Suicide
The act of intentionally causing one's own death.
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