Ars Technia LLD published a news release (Eric Bangeman, "Dell Still King of Market Share") that presented the results of a study concerning the world market share for the major manufacturers of personal computers. It indicated that Dell held 17.9% of this market. The file entitled PCMarket contains a sample of the market shares alluded to in the article.
a. Construct a histogram from this set of data and identify the sample shares for each of the listed manufacturers.
b. Excluding the data referred to as "other," determine the total share of the sample for manufacturers that have headquarters in the United States.