Need to draw hierarchy chart, IPO chart, and flow chart

and return the calc average. This function should accept five test scores as arguments average of the scores. determine grade. This function should accept a test score as an argument and return a letter grade for the score based on the following grading scale: Letter Grade Score 90-100 80-89 70-79 60-69 Below 60 Deliverables: 1. Draw hierarchy chart 2. Draw IPO chart for each function 3. Draw flowchart (can use paper & pencil and scan method)