arr
정렬function trimMean(arr: number[]): number {
const sorted = arr.toSorted((a, b) => a - b)
const removeCount = Math.floor(arr.length * 0.05)
for(let i = 0; i < removeCount; i++) {
sorted.shift()
sorted.pop()
}
const sum = sorted.reduce((acc, cur) => acc + cur, 0)
return sum / sorted.length
};