For the data set find the range and use it to approximate the value of s. Then calculate the actual value of s. Is the actual value close to the estimate?

Smiles per Mile A survey by Consumer Reports looked at the reliability of cars as the cars get older. They surveyed owners of cars that were 3 years old, and recorded the average yearly repair and maintenance costs (in dollars) for 15 different models of compact cars

125 45 115 25 40 125 55 90 25 110 115 120 45 105 110 80 20