Listed below are the numbers of hurricanes that occurred in each year in a certain region. The data are listed in order by year. Find the range, variance, and standard deviation for the given sample data. Include appropriate units in the results. What important feature of the data is not revealed by any of the measures of variation? 20 CO The standard deviation of the sample data is 4.1 hurricanes. (Round to one decimal place as needed.) The variance of the sample data is (Round to one decimal place as needed.)