Total passing students of college A = 200 × 68/100 + 200 × 72/100 + 200 × 74/100 = 136 + 144 + 148 = 428
Average passing percentage of college A = 428/600 × 100 = 71.33%
Total passing students of college B = 200 × 65/100 + 200 × 68/100 + 200 × 77/100 = 130 + 136 + 154 = 420
Total passing percentage of college B = 420/600 × 100 = 70%
Total passing students of college C = 200 × 80/100 + 200 × 88/100 + 200 × 92/100 = 160 + 176 + 184 = 520
Total passing percentage of college C = 520/600 × 100 = 86.66%
Total passing students of college D = 200 × 92/100 + 200 × 95/100 + 200 × 98/100 = 184 + 190 + 196 = 570
Total passing percentage of college D = 570/600 × 100 = 95%
Total passing students of college E = 200 × 72/100 + 200 × 75/100 + 200 × 73/100 = 144 + 150 + 146 = 440
Total passing percentage of college E = 440/600 × 100 = 73.33%
Average passing percentage of college B is the least.