const familyData = [
  { name: "Homer", ranking: 62 },
  { name: "Marge", ranking: 28 },
  { name: "Bart", ranking: 70 },
  { name: "Lisa", ranking: 44 },
  { name: "Maggie", ranking: 200 }
];

function orderByRank(data = []) {
  function compareByRank(mem1, mem2) {
    let result;
    if (mem1.ranking < mem2.ranking) {
      result = -1;
    } else if (mem1.ranking > mem2.ranking) {
      result = 1;
    } else {
      result = 0;
    }

    return result;
  }

  return data.sort(compareByRank);
}

function getAvgRanking(data = []) {
  return familyData.reduce((acc, mem) => {
    return acc + mem.ranking;
  }, 0) / familyData.length;
}