I don't know what Im doing wrong

Suppose a researcher is investigating the effectiveness of a new drug that may prevent the contraction of bovine spongiform encephalopathy (Mad Cow Disease) in cattle by bonding to the protein that transmits the disease, allowing it to be filtered naturally from the body without infecting the host. A count of 200 bootstrap replicate estimates for an estimate of the mean percentage of successfully bonded proteins in samples of bovine tissue are created. The list of 200 bootstrap replicate samples is arranged in ascending order. The lowest 10 values and the highest 10 values of this ordered list are provided. (72.22, 72.58, 72.80, 72.91, 73.08, 73.44, 74.65, 74.69, 74.77, 74.91, ...) (..., 79.82, 80.03, 80.17, 80.52, 80.76, 81.54, 81.91, 82.03, 82.31, 82.56) Create an approximate 95% confidence interval for the mean percentage of successfully bonded proteins. Lower bound: 76.83 Incorrect Upper bound: 77.94