The U.S. Census Bureau collects information about divorce rates. The following table summarizes the divorce rate for 10 U.S. states in 2007. Use the table to answer the questions that follow.

a. Calculate and interpret the range and the IQR. Which is a better measure of variability? Why?
b. Calculate and interpret the mean and standard deviation.
c. Identify two possible explanations for the variation in divorce rates across the 10 states.

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State Alaska Florida Idaho Maine Maryland Nevada New Jersey Texas Vermont Wisconsin Divorce Rate per 1,000 Population 4.3 4.9 4,5 3.1 6.5 3.0 3.3 3.8 2.9