The following table indicates the percentage of residential electricity consumption in the United States, organized by type of appliance in a recent year:
Type of Appliance Percentage (%)
Air conditioning........................................18
Clothes dryers............................................5
Clothes washers/other.................................24
Computers................................................1
Cooking...................................................2
Dishwashers.............................................2
Freezers...................................................2
Lighting................................................16
Refrigeration............................................9
Space heating...........................................7
Water heating..........................................8
TVs and set top boxes.................................6
a. Construct a bar chart, a pie chart, and a Pareto chart.
b. Which graphical method do you think is best for portraying these data?
c. What conclusions can you reach concerning residential electricity consumption in the United States?