[프로그래머스 C#]

 

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using System;

public class Solution {
    public double solution(int[] numbers) {
        double answer = 0;
        
        for(int i = 0; i < numbers.Length; i++)
        {
            answer += numbers[i];
        }
        
        answer /= numbers.Length;
        
        return answer;
    }
}