need help been try the same question for an hour not understanding what im doing wrong.

The following data represent the concentration of organic carbon (mg/L) collected from organic soil. Construct_a 99% condence interval for the mean concentration of dissolved organic carbon collected from organic soil. (Note: x = 17.27 mg/L and s = 7.83 mg/L) 5 Click the icon to view the table of areas under the t-distribution. Construct a 99% condence interval for the mean concentration of dissolved organic carbon collected from organic soil. ( ) (Use ascending order. Round to two decimal places as needed.) 15.72 8.81 30.91 19.80 29.80 17.50 14.86 14.86 27.10 20.46 11.90 8.09 16.51 14.90 15.35 11.90 5.30 33.67 9.72 18.30