What is the standard deviation of the returns on a stock given the following information? 
Definitions:
Stroke
A medical condition where poor blood flow to the brain results in cell death, leading to potential physical and cognitive impairments.
Sensitivity
Sensitivity is the ability to perceive and respond to changes in the environment or stimuli.
Motor Homunculus
A visual representation of the body within the brain, illustrating the proportion of motor cortex dedicated to each body part's motor function.
Elephant
A large mammal known for its long trunk, large ears, and significant intelligence, native to Africa and Asia.
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