The U.S. Chemical Safety and Hazard Investigation Board (CSB) is responsible for determining the root cause of

Question:

The U.S. Chemical Safety and Hazard Investigation Board (CSB) is responsible for determining the root cause of industrial accidents (Process Safety Progress, Dec. 2004). The accompanying table gives a breakdown of the root causes of 83 incidents caused by management system failures.

a. Find the relative frequency of the number of incidents for each cause category.
b. Construct a Pareto diagram for the data.
c. From the Pareto diagram, identify the cause categories with the highest (and lowest) relative frequency of incidents.