Question

Consider the below matrix A, which you can copy and paste directly into Matlab. The matrix contains 3 columns, which represent the final grades in a course with 3 sections of equal size. The first column is C01, the second is C02, and the third is C03.

A = [60.04 32.21 100;100 39.64 97.32;42.07 100 74.1;40.25 33.88 67.52;21.38 32.93 44.62;85.55 42.16 100;97.7 72.9 77.92;100 32.62 47.05;54.23 91.14 100;100 87.63 26.47;100 39.55 73.36;16.82 47.64 92.65;41.72 48.01 84.1;100 42.78 77.77;88.02 90.3 59.16;100 80.88 65.91;100 37.77 58.94;94.4 100 62.23;12.84 85.6 100;81.58 90.31 29.04;78.64 29.65 56.31;19.52 13.83 51.82;32.58 66.82 100;88.18 56.2 76.98;16.19 52.49 27.75;24.25 30.85 52.76;92.51 89.35 87.5;78.63 20.49 37.05;38.13 94.94 100;67.91 16.65 100;33.3 30.98 99.79;35.18 39.16 50.22;84.73 28.04 74.68;84.16 39.77 58.43;100 27.43 100;43.37 15.72 25.66;100 13.63 60.06;100 22.89 48.89;20.9 40.42 100;37.66 68.96 27.16;12.74 71.98 61.51;40.38 38.92 80.51;14.34 58.87 33.19;86.52 43.87 100;92.54 69.1 44.42;80.01 28.66 41.65;29.28 16.05 100;43.49 33.8 80.7;91.04 13.52 37.26;79 12.58 56.58;19.81 64.01 28.42;23 96.14 89.76;78.19 49.34 39.9;71.45 100 100;48.1 93.45 100;96.81 10.39 100;59.69 81.73 77.28;97.68 100 89.68;90.6 49.36 75.22;71.86 100 49.42;24.21 24.55 73.34;76.21 66.67 23.14;100 100 21.83;100 33.24 100;100 35.26 38.52;73.96 86.29 100;98.93 74.31 36.71;41.14 93 81.59;83.49 63.26 100;47.61 64.89 79.8;27.51 72.71 100;36.84 55.83 37.89;30.04 31.5 97.02;70.85 69.63 48.47;21.88 57.79 20.32;16.6 98.1 37.65;79.99 13.6 30.73;97.18 29.38 100;60.82 79.62 34.24;39.11 41.3 23.59;66.01 27.62 46.92;85.09 83.75 75.42;100 81.93 28.75;88.35 88.11 49.96;52.15 38.1 84.21;97.95 69.75 22.61;100 80.31 91.33;24.41 77.56 100;75.33 64.31 92.18;48.83 92.16 38.92;41.27 33.85 20.54;95.67 89.99 60.57;23.64 86.32 43.44;26.6 100 21.32;40.53 54.47 40.83;87.58 76.04 31.82;56.81 98.63 100;93.66 69.32 100;23.11 100 18.88;49.8 73.04 49.08;26.34 28.81 57.48;70.91 77.23 45.13;42.02 19.72 71.87;78.33 28.91 91.17;89.95 100 24.8;27.06 89.98 59.72;39.75 99.05 38.99;15.69 14.94 100;13.31 88.63 61.63;42.9 92.18 50.97;19.48 29.65 47.83;97.94 26.93 51.32;36.97 22.23 49.88;84.88 25.46 80.97;99.23 34.43 38.17;49.83 78.69 28.17;100 37.8 79.54;15.43 45.15 57.55;100 61.37 99.14;42.23 63.75 47.33;51.28 95.14 98.12;83.04 82.21 65.22;17.51 13.09 90.06;48.82 40.08 53.88;22.5 98.32 100;42.12 83.4 81.72;18.26 100 100;19.79 99.94 20.64;34.31 34.07 61.81;61.31 74.97 95.92;69.04 49.04 64.64;69.99 35 24.17;81.26 60 42.55;100 71.74 100;47.13 52.66 100;25.43 61.43 73.49;35.69 100 99.62;65.48 52.83 44.59;100 46.82 87.04;21.16 35.89 24.04;77.82 25.58 33.38;14.03 87.1 49.37;75.93 29.87 57.41;100 42.61 18.41;56.92 100 32.18;89.53 72.4 59.09;59.51 100 19.55;94.13 18.2 43.44;80.08 68.53 72.44;69.62 63.76 82.78;71.41 66.19 40.87;28.9 87.12 74.67;56.84 17.26 70.41;50.12 57.18 29.9;28.44 100 100;61.88 47.28 99.7;43.55 32.8 100;45.83 57.34 100]

(a) Use the colon operator to extract the marks from C02, and then find the average of those marks (using the 'sum' and 'length' commands).

(b) Use vertical concatenation to create a single column vector consisting of all of the marks from all 3 sections. Then find the overall class average.

Answer 1