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Update Use the reduce Method to Analyze Data.md

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`@@ -148,3 +148,18 @@ let averageRating = watchList.reduce((accumulator, current) => {`
`148`	`148`	`}`
`149`	`149`	`return accumulator`
`150`	`150`	`},0)/movieCount`
	`151`	`+`
	`152`	`+========================`
	`153`	`+`
	`154`	`+function getRating(watchList){`
	`155`	`+ // Only change code below this line`
	`156`	`+ // Only change code below this line`
	`157`	`+ let movieCount = 0`
	`158`	`+ var averageRating = watchList.filter(fItem => fItem.Director === 'Christopher Nolan').reduce((acc, curr) => {`
	`159`	`+ let total = acc + Number(curr.imdbRating)`
	`160`	`+ movieCount++;`
	`161`	`+ return total`
	`162`	`+ }, 0)`
	`163`	`+ // Only change code above this lin`
	`164`	`+ return averageRating / movieCount;`
	`165`	`+}`

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