더 간단한 코드를 작성한 것 같습니다. 한번 봐주세요!

kor_score = [49, 79, 20, 100, 80]
math_score = [43, 59, 85, 30, 90]
eng_score = [49, 79, 48, 60, 100]
midterm_score = [kor_score, math_score, eng_score]

student_average = [0,0,0,0,0]

for i in range(0,5):
        sum = midterm_score[0][i] + midterm_score[1][i] + midterm_score[2][i]
        student_average[i] = sum / 3
print(student_average)