如何在给定String[][]和预期返回String[][]的情况下计算平均成绩

public String[][] calculateAverageScore(String[][] scores) {
    int numStudents = scores.length;
    int numSubjects = scores[0].length;

    int[] sumScores = new int[numSubjects];
    String[][] averageScores = new String[numStudents][numSubjects];

    // 计算每个科目的总分
    for (int i = 0; i < numStudents; i++) {
        for (int j = 0; j < numSubjects; j++) {
            int score = Integer.parseInt(scores[i][j]);
            sumScores[j] += score;
        }
    }

    // 计算平均成绩并格式化为String类型
    for (int i = 0; i < numStudents; i++) {
        for (int j = 0; j < numSubjects; j++) {
            int average = sumScores[j] / numStudents;
            averageScores[i][j] = String.format("%.2f", average);
        }
    }

    return averageScores;
}