Suppose sales from students at the University of Houston are shown in the provided output. Based on the data and results, what is the MSE of the best fitting model?

Week - Sales 1129 1157 1138 1120 1130 1132 1188 1151 1129 1118 1125 1147 1162 1190 1137 Chegg Sales 1200 1190 1140 1170 1100 1150 1140 1130 1120 1110 2 10 12 14 16 4-period Moving Average Period 1 2 3 4 6 7 8 Forecast #N/A #N/A #N/A #N/A 1134.50 1136.25 Error #N/A #N/A #N/A #N/A Sq Error #N/A #N/A #N/A #N/A -4.50 20.25 -4.25 18.06 1130.00 58.00 3364.00 9 1150.25 -21.25 451.56 10 1150.00 -32.00 1024.00 11 1146.50 -21.50 462.25 12 1130.75 16.25 264.06 13 1129.75 32.25 1040.06 14 1138.00 52.00 2704.00 15 1156.00 -19.00 Sum 64.50 361.00 9781.50 2 3 5 6 7 8 9 10 11 1123.00 34.00 1156.00 1133.20 4.80 23.04 1134.64 -14.64 214.33 1130.25 -0.25 0.06 1130.17 1.83 3.34 1130.72 57.28 3280.82 1148.83 -19.83 393.37 1142.88 -24.88 619.19 1135.42 -10.42 108.54 12 1132.29 14.71 216.30 13 1136.71 25.29 639.84 14 1144.29 45.71 2089.08 15 1158.01 -21.01 441.23 Sum 95.68 9194.72 Exponential Smoothing: a 0.3 Period 1 Forecast #N/A Error #N/A Sq Error #N/A 3-period Moving Average Period 1 2 3 Forecast #N/A #N/A #N/A Error #N/A #N/A #N/A 1139.33 -19.33 5 1138.33 6 7 8 10 -8.33 Sq Error #N/A #N/A #N/A 373.78 69.44 1129.33 2.67 7.11 1127.33 60.67 3680.44 1157.00 -28.00 784.00 1156.00 -38.00 1444.00 11 1132.67 -7.67 58.78 12 1124.00 23.00 529.00 13 1130.00 32.00 1024.00 14 1144.67 45.33 2055.11 15 1166.33 -29.33 Sum 34.00 860.44 10887.11 Exponential Smoothing: a = 0.2 Period 1 2 3 4 Forecast #N/A 1123.00 Error #N/A 34.00 Sq Error #N/A 1156.00 1129.80 8.20 67.24 1131.44 5 1129.15 6 7 8 1129.32 -11.44 0.85 2.68 130.87 0.72 7.17 1129.86 58.14 3380.58 9 1143.39 10 1140.51 11 1136.01 -14.39 -22.51 -11.01 207.03 506.74 121.19 12 1133.81 13.19 174.06 13 1136.45 25.55 653.03 14 1141.56 48.44 2346.78 15 1151.25 Sum -14.25 126.98 202.93 9044.85