The Excel file here darr provides the fleet composition data for Delta Airlines as of Jan. $2022.$

Its fleet consisted of $819$ aircraft made by Airbus, Boeing, and Embraer. Using the data

provided, calculate the Blau's Index of Fleet Heterogeneity at the aircraft model and at the

aircraft manufacture level, respectively. Develop a foxplot graph to show the distribution of

age across all aircraft in the fleet of Delta Airline. Upload your calculation results and boxplot

graph onto Canvas.