We show the companies with the largest oil-refining capacity in the world according to Forbes. Use these population data and answer the questions.

a. What are the values of the mean and the median? Compare the answers and state which you prefer as a measure of location for these data and why.b. What are the values of the range and interquartile range? How do they differ?c. What are the values of the variance and standard deviation for these data?d. What is the z score for Saudi Aramco? What is the z score for ExxonMobil? Interpret these z scores.e. Calculate the Pearsonian coefficient of skewness and comment on the skewness of this distribution.

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Company Saudi Aramco Gazprom National Iranian Oil Company ExxonMobil PetroChina BP Royal Dutch Shell Pemex Chevron Corporation Kuwait Petroleum Corporation Abu Dhabi National Oil Company Capacity (barrels per day in millions) 12.5 9.7 6.4 5.3 4.4 4.1 3.9 3.6 3.5 3.2 2.9