Find the standard deviation σ for the following probability distribution.Round your answer to three decimal places. 
Definitions:
Bolus
A small rounded mass of a substance, especially of chewed food at the moment of swallowing.
Esophagus
The part of the digestive tract that conducts food from the pharynx to the stomach.
Amylase
An enzyme that catalyzes the hydrolysis of starch into sugars, present in saliva and pancreatic fluid.
Starch
A carbohydrate consisting of a large number of glucose units joined by glycosidic bonds, primarily found in plants and used as an energy store.
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