Suppose that you are writing a program for calculating the final grades of

students using tabular data. In the data table, the first column is student id$,$ second is

midterm grade, and third is quiz grade.

Before you calculate the overall grade, you need to calculate the centered grade for

each individual exam. To calculate the centered grade for each exam, you would need

to calculate the average of that exam $($or quiz$)$ individually, then subtract the

calculated average from each student's grade for that exam and add $60$ to the outcome.

Lastly, you need to weigh the exam with its respective grade $(30\%$ for midterm, $30\%$

for quiz and $40\%$ for the final$)$ and add them up to calculate the overall grade.

Suppose that you read the data from a comma separated values $(.$csv$)$ file and write

your output to another $(.$csv$)$ file.

a$.(10$ Points$)$ For this program, draw a diagram showing the program structure and

individual modules that you would develop.

b$.(10$ Points$)$ Describe the error classes that you would use for each module of this

program.

c$.(20$ Points$)$ For each module, describe the test cases you would use considering

that you are using extreme programming paradigm