Laptop Sales at a London Computer Chain: Bar Charts and Boxplots. The file Laptop SalesJanuary 2008.xls contains data for all sales of laptops at a computer chain in London in January 2008. This is a subset of the full dataset that includes data for the entire year. a. Create a bar chart, showing the average retail price by store. Which store has the highest average? Which has the lowest? b. To better compare retail prices across stores, create side-by-side boxplots of retail price by store. Now compare the prices in the two stores from (a). Does there seem to be a difference between their price distributions?