Shown here are the U.S. oil refineries with the largest capacity in terms of barrels per day according to the U.S. Energy Information Administration. Use these as 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 variance and standard deviation for these data?
d. What is the z score for Pascagoula, Mississippi? What is the z score for Texas City, Texas? Interpret these z scores.
e. Calculate the Pearsonian coefficient of skewness and comment on the skewness of thisdistribution.

Refinery Location Capacity Baytown, lexas Baton Rouge, Louisiana Texas City, Texas Lake Charles, Louisiana Whiting, Indiana Beaumont, Texas Philadelphia, Pennsylvania Pascagoula, Mississippi Deer Park, Texas Wood River, Illinois Port Arthur, Texas Company ExxonMob 567,000 ExxonMo 503,000 BP Citgo ExxonMobil 348,500 Sunoco Chevron partnership WRB Premcor 467,720 429,500 410,000 335,000 330,000 329,800 306,000 289,000