The following table shows part of the probability distribution for a random variable x. 
a.The mean of the above distribution is known to be 1.8 .
b.Compute the variance and the standard deviation for the above probability distribution.
Definitions:
Cones
Photoreceptor cells in the retina of the eye responsible for color vision and visual acuity under bright light conditions.
Fovea Centralis
Region of the retina consisting of densely packed cones; responsible for the greatest visual acuity.
Tectorial Membrane
A structure located in the cochlea of the inner ear that plays a critical role in the process of hearing by interacting with hair cells.
Otolith
Calcium carbonate granule associated with sensory receptors for detecting movement of the head; in vertebrates, located in the utricle and saccule.
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