Question: Suppose Procter & Gamble sells about 20 million bars of soap per week, but the demand is not constant and production management would like to get a better handle on how sales are distributed over the year. Let the following sales figures given in units of million bars represent the sales of bars per week over one year. Construct a histogram to represent these data. What do you see in the graph that might be helpful to the production (and sales) people?

Construct a stem-and-leaf plot using the whole numbers as the stems. What advantages does the stem-and-leaf plot of these sales figures offer over the histogram? What are some disadvantages? Which would you use in discussions with production people, and why?