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:
Manufacturing Overhead
includes all indirect costs related to manufacturing, such as salaries of supervisors and maintenance costs, that are not directly tied to a specific product.
Job-order Costing
A costing method used by companies to assign manufacturing costs to individual products or batches, ideal for customized orders.
Overhead Cost
A rephrased definition: Expenses related to the day-to-day running of a business that are not directly linked to any specific product or service, such as administrative expenses.
Work in Process
The cost of unfinished goods in the manufacturing process including labor, material, and overhead.
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