For a study of the effectiveness of incarceration for driving while intoxicated (DWI), the following SAMPLE of prison sentences (in months) is tabulated 12 8 9 15 11 3 9 7 15 Calculate the range...

For a study of the effectiveness of incarceration for driving while intoxicated (DWI), the following SAMPLE of prison sentences (in months) is tabulated

12   8      9      15    11    3      9      7      15

1. Calculate the range (Discrete)


2. Calculate the variance  (Round to the nearest hundredth if necessary)


3. Calculate the standard deviation (to the nearest hundredth if necessary)