For the following frequency distribution (assume the data represent a population), 
a.Compute the mean.
b.Compute the standard deviation.
Definitions:
Language
A system of communication that is governed by a system of rules (a grammar) and can express an infinite number of propositions.
Expressive Aphasia
A neurological disorder characterized by the impaired ability to produce language (spoken or written) despite being able to understand it, typically resulting from brain damage.
Receptive Aphasia
A neurological condition characterized by difficulties in understanding spoken or written language, despite intact sensory function.
Written Language
A system of symbols and signs used to convey complex messages and ideas through the physical medium of writing.
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