1. 先求陣列中全部元素的總和
2. 將總和除以素數，得平均

程式碼

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class AverageArray : MonoBehaviour
{
    // Start is called before the first frame update
    void Start()
    {
        int[] score = { 72, 50, 47, 14, 98, 6, 55, 84 };

        int sum = 0;

        for(int i = 0; i < score.Length; i++)
        {
            sum += score[i];
        }

        float average = 1.0f * sum / score.Length;
        Debug.Log(average);
    }
}

Console輸出

參考來源：Unity 遊戲設計育成攻略