Finding Population Statistics In Exercises 13 and 14 , find the range, mean, variance, and standard deviation of the population data set. 13. Drunk Driving The numbers of alcohol- impaired crash fatalities (in thousands) per year from 2005 through 2015 (Source: National Highway Traffic Safety Administration) 14. Density The densities (in kilograms per cubic meter) of the ten most abundant elements by weight in Earth's crust.