1、输入10个学生5门课的成绩，分别用函数实现下列功能1计算每个学生的平均分；2计算没门课的平均法；3找出50个分数中最小的分数所对应的学生和课程；0 -.2x－( ) 4计算平均方差其中×为某一学生的平均分

1. 计算每个学生的平均分：

def avg_score_student(scores):
    avg_scores = []
    for i in range(len(scores)):
        avg_scores.append(sum(scores[i])/len(scores[i]))
    return avg_scores

2. 计算每门课的平均分：

def avg_score_course(scores):
    avg_scores = []
    for i in range(len(scores[0])):
        sum_score = 0
        for j in range(len(scores)):
            sum_score += scores[j][i]
        avg_scores.append(sum_score/len(scores))
    return avg_scores

3. 找出所有50个分数中最高的分数所对应的学生和课程：

def max_score(scores):
    max_score = 0
    max_student = 0
    max_course = 0
    for i in range(len(scores)):
        for j in range(len(scores[i])):
            if scores[i][j] > max_score:
                max_score = scores[i][j]
                max_student = i+1
                max_course = j+1
    return max_student, max_course

4. 计算平均分方差：

def variance(scores, avg_scores):
    var_scores = []
    for i in range(len(scores)):
        sum_var = 0
        for j in range(len(scores[i])):
            sum_var += (scores[i][j] - avg_scores[i])**2
        var_scores.append(sum_var/len(scores[i]))
    return var_scores