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풀이

class Solution {
    public double solution(int[] arr) {
        //배열 값 모두 더하기
        int sum = 0;
        for(int i=0; i<arr.length; i++){
            sum += arr[i];
        }
        
        //평균 구하기
        double answer = (double) sum / arr.length;
        return answer;
    }
}
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