any help would be greatly appreciated

listed below are speeds (mi/h) measured from traffic on a busy highway. This simple random sample was obtained at 3:30 RM on a weekday Use the sample data to construct a 95%% confidence interval estimate of the population standard deviation 62 65 65 56 65 53 60 59 60 69 01 68 Click the icon to view the table of Chi-Square critical values! The confidence interval estimate is |miho (Round to one decimal place as needed.)