What is the standard deviation of a portfolio which is invested 10% in stock A, 35% in stock B and 55% in stock C? 
Definitions:
Opponent-process Theory
A psychological and neurological model that explains how humans perceive colors as the brain processes signals from the eyes in an antagonistic manner.
Bipolar Cell
A type of neuron found in the retina that plays a role in the transmission of visual information from photoreceptors to ganglion cells.
Spontaneous Rate
In neuroscience, it refers to the baseline firing rate of a neuron when not being stimulated.
Trichromatic Theory
A theory of color vision stating that the human eye has three types of receptors with differing sensitivities to different light wavelengths.
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