The accompanying cumulative relative frequency distribution shows a summary of the scores from an Algebra II exam at a local high school.Twenty students took the exam. 
a.Construct the relative frequency distribution.What proportion of students scored between 81 and 90?
B)Construct the frequency distribution.How many students scored between 71 and 80?
C)Construct an ogive.What is the approximate percentage of students that scored less than 85?
Definitions:
Existential Import
A property of categorical propositions; a proposition has existential import if its truth depends on the existence of things of the kinds specified by terms in the proposition.
Contrary
Opposing or differing in nature, direction, or meaning; in logic, it refers to propositions that cannot both be true but can both be false.
Proposition
An articulation or statement that communicates a judgement or perspective.
Disproven
Shown to be false or incorrect through evidence or logical argument.
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