export function relativeFrequency(numbers: number[]): Record<string, number> {  
  let counts : Record<string, number> = {}
  for(let num of numbers) {
    if(counts[num]) counts[num] = (counts[num] || 0) + 1
    else counts[num] = 1
  }
  let res: Record<string, number> = {}
  for(let [key, value] of Object.entries(counts)){
    res[key]= +(value /numbers.length).toFixed(4)
  }
  return res;
}