The Pareto principle states that: Group of answer choices Quality management causes 80% of all problems on a typical project. The Pareto chart is the most important of the seven basic tools of quality control. The majority of nonconformities are caused by a relatively small percentage of the total set of problems. Improvement efforts should be focused on these critical problems. It is normally only cost-effective to correct 80% of defects, the other 20% is not worth correcting