Find the standard deviation σ for the following probability distribution.Round your answer to three decimal places. 
Definitions:
Working Memory
A cognitive system with a limited capacity that is responsible for temporarily holding information available for processing.
Phonology
A branch of linguistics concerned with the systematic organization of sounds in languages, specifically how they are used to encode meaning and affect language structure.
Over-Extension
A common linguistic error in early childhood where a word is used too broadly, covering unrelated objects or concepts.
Bilingualism
The ability of an individual to use two languages effectively.
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