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prove-ability prove-ability

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Add 평균-구하기.js

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- 평균-구하기.js

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`‎level-1/평균-구하기.js`

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Original file line number	Diff line number	Diff line change
`@@ -23,3 +23,12 @@ function solution(arr) {`
`23`	`23`	`// sum을 arr의 요소의 갯수로 나눈 후 반환`
`24`	`24`	`return sum / arr.length;`
`25`	`25`	`}`
	`26`	`+`
	`27`	`+// 정답 4 - prove-ability`
	`28`	`+function solution(arr) {`
	`29`	`+ var answer = 0;`
	`30`	`+ arr.forEach((num) => {`
	`31`	`+ answer += num`
	`32`	`+ })`
	`33`	`+ return answer / arr.length;`
	`34`	`+}`

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