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feat: add typescript solution to lc problem: No.1619.Mean of Array After Removing Some Elements (doocs#578)

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Original file line number	Diff line number	Diff line change
`@@ -81,6 +81,20 @@`
`81`	`81`
`82`	`82`	```
`83`	`83`
	`84`	`+### TypeScript`
	`85`	`+`
	`86`	+```ts
	`87`	`+function trimMean(arr: number[]): number {`
	`88`	`+ arr.sort((a, b) => a - b);`
	`89`	`+ let n = arr.length, rmLen = n * 0.05;`
	`90`	`+ let sum = 0;`
	`91`	`+ for (let i = rmLen; i < n - rmLen; i++) {`
	`92`	`+ sum += arr[i];`
	`93`	`+ }`
	`94`	`+ return sum / (n * 0.9);`
	`95`	`+};`
	`96`	+```
	`97`	`+`
`84`	`98`	`### ...`
`85`	`99`
`86`	`100`	```

Lines changed: 14 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -71,6 +71,20 @@`
`71`	`71`
`72`	`72`	```
`73`	`73`
	`74`	`+### TypeScript`
	`75`	`+`
	`76`	+```ts
	`77`	`+function trimMean(arr: number[]): number {`
	`78`	`+ arr.sort((a, b) => a - b);`
	`79`	`+ let n = arr.length, rmLen = n * 0.05;`
	`80`	`+ let sum = 0;`
	`81`	`+ for (let i = rmLen; i < n - rmLen; i++) {`
	`82`	`+ sum += arr[i];`
	`83`	`+ }`
	`84`	`+ return sum / (n * 0.9);`
	`85`	`+};`
	`86`	+```
	`87`	`+`
`74`	`88`	`### ...`
`75`	`89`
`76`	`90`	```

Lines changed: 9 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,9 @@`
	`1`	`+function trimMean(arr: number[]): number {`
	`2`	`+ arr.sort((a, b) => a - b);`
	`3`	`+ let n = arr.length, rmLen = n * 0.05;`
	`4`	`+ let sum = 0;`
	`5`	`+ for (let i = rmLen; i < n - rmLen; i++) {`
	`6`	`+ sum += arr[i];`
	`7`	`+ }`
	`8`	`+ return sum / (n * 0.9);`
	`9`	`+};`

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