Environmental scientists measured the greenhouse gas emissions of a sample of cars. The amounts listed below are in tons (per year), expressed as equivalents. Is the value of 9.3 tons unusual?

7.2 7.1 7.4 7.9 6.5 7.2 8.2 9.3

Find the range, variance, and standard deviation for the given sample data. Include appropriate units (such as “minutes”) in your results. (The same data were used in Section 3-2 where we found measures of center. Here we find measures of variation.) Then answer the given questions.