Get `n` random numbers between 2 given numbers having average `x`

RandomNumbesWithFixedAverage.js

function getRandom(min, max) {
  return Math.random() * (max - min) + min;
}
function getArr(size, avg, min, max) {
  let arr = [];
  let tmax = max;
  let tmin = min;
  while (arr.length < size) {
    const variable1 = +getRandom(min, tmax).toFixed(1);
    let variable2 = +(avg * 2 - variable1).toFixed(1);
    if (variable2 < min) {
      tmax = max - (min - variable2);
      variable2 = min;
    } else if (variable2 > max) {
      tmin = min + (variable2 - max);
      variable2 = max;
    } else {
      tmax = max;
      tmin = min;
    }
    arr = arr.concat([variable1, variable2]);
  }
  let sumErr = arr.reduce((a, b) => a + b, 0) - avg * size;
  if (sumErr > 0) {
    arr = arr.map((x) => {
      if (x > min && sumErr > 0.001) {
        let maxReduce = x - min;
        if (maxReduce > sumErr) {
          const toReturn = +(x - sumErr).toFixed(1);
          sumErr = 0;
          return toReturn;
        } else {
          sumErr -= maxReduce;
          return min;
        }
      }
      return x;
    });
  } else {
    arr = arr.map((x) => {
      if (x < max && sumErr < -0.001) {
        let maxAdd = max - x;
        if (maxAdd > Math.abs(sumErr)) {
          const toReturn = +(x + Math.abs(sumErr)).toFixed(1);
          sumErr = 0;
          return toReturn;
        } else {
          sumErr += maxAdd;
          return max;
        }
      }
      return x;
    });
  }

  return arr.sort(() => Math.random() - 0.5);
}

getArr(10, 2.01, 0.5, 2.5); // [0.5, 3.8, 2.4, 3.4, 0.5, 3.8, 0.6, 0.5, 0.7, 3.9]