Suppose that the data are arranged in increasing order, T% of the observations are removed from each end, and the sample mean of the remaining numbers is calculated. The resulting quantity is called a trimmed mean. 94.1 87.3 94.1 92.4 84.6 85.4 93.2 84.1 92.1 90.6 83.6 86.6 90.6 90.1 96.4 89.1 85.4 91.7 91.4 95.2 88.2 88.8 89.7 87.5 88.2 86.1 86.4 86.4 87.6 84.2 86.1 94.3 85.0 85.1 85.1 85.1 95.1 93.2 84.9 84.0 89.6 90.5 90.0 86.7 78.3 93.7 90.0 95.6 92.4 83.0 89.6 87.7 90.1 88.3 87.3 95.3 90.3 90.6 94.3 84.1 86.6 94.1 93.1 89.4 97.3 83.7 91.2 97.8 94.6 88.6 96.8 82.9 86.1 93.1 96.3 84.1 94.4 87.3 90.4 86.4 94.7 82.6 96.1 86.4 89.1 87.6 91.1 83.1 98.0 84.5 (a) Calculate the 10% trimmed mean for the yield data, (b) Calculate the 20% trimmed mean for the yield data