As a Quality Analyst see the defects trend by type of defects and are plotting a histogram to do a Pareto analysis. Invent your own data to come up with a Pareto diagram, clearly identifying the top 20% category of defects, and once done, deep-dive into the top category to do a Root Cause Analysis and come up with corrective action and preventive action plan. Please state your assumptions clearly at the beginning of your answer.

a. Plot a neat histogram on plain paper, and identify the top 20% of the category of defects that contribute to 80% of the total volume of defects.

b. Once you identify these top 20% defects, perform a Root Cause Analysis for the Top Contributing Factor using either 5-Why or the Fish-bone diagram method.

c. Then, come up with a suitable corrective action plan and a preventive action plan to address the root cause, which should include who will do what.