The following is a frequency distribution of grades for a statistics examination. 
Treating these data as a sample, compute the following:
A)The mean
B)The standard deviation
C)The variance
D)The coefficient of variation
Definitions:
Supreme Court
The highest judicial authority in a country or state, responsible for interpreting the law and deciding on legal disputes.
Inequalities
Situations or circumstances where resources, opportunities, and rights are distributed unevenly or unfairly among different groups of people.
Kenneth Clark
An African American psychologist whose research on the effects of racial segregation was instrumental in the Brown v. Board of Education case, helping to end legal racial segregation.
Public Schools
Educational institutions that are funded and operated by government agencies to provide free education to all children.
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