Each year, tornadoes that touchdown are recorded by the Storm Prediction Center and published in Monthly Tornado

Question:

Each year, tornadoes that touchdown are recorded by the Storm Prediction Center and published in Monthly Tornado Statistics. The following table gives the number of tornadoes that touched down in the United States during each month of one year.

Determine the range and sample standard deviation for each of the data sets. For the sample standard deviation, round each answer to one more decimal place than that used for the observations.