複数の数値が定義されている配列data1とdata2から「data1とdata2を合わせた平均値」と「平均値以上の数値」を表示せよ #JavaScript

<!DOCTYPE html>
<html lang="ja">
<head>
    <meta charset="UTF-8">
    <title>課題</title>
    <script>
        var data1 = [59, 39, 100, 2, 15, 40, 84, 97];
        var data2 = [63, 18, 64, 97, 50, 98];
        document.write('<p>【data1】' +data1  + '</p>'); 
        document.write('<p>【data2】' +data2  + '</p>'); 

        var data3 = [];
        var sum = 0;
        var ave = 0;

        for(var i = 0; i < data1.length; i++){
          data3.push(data1[i]);
        } 
        for(var i = 0; i < data2.length; i++){
          data3.push(data2[i]);
        } 

        document.write('<p>【マージ後】' +data3  + '</p>'); 


        for(var i = 0; i < data3.length; i++){
          sum = sum + data3[i]
        } 

        ave = sum / data3.length;

        document.write('<p>data1とdata2を合わせた平均値' +ave+ '</p>'); 

        document.write('<p>平均値以上の数値は以下</p>'); 



        for(var i = 0; i < data1.length; i++){
          if( data1[i] >= ave)
          document.write('<p>data1:' +data1[i]+'</p>'); 
        } 

        for(var i = 0; i < data2.length; i++){
          if( data2[i] >= ave)
          document.write('<p>data2:' +data2[i]+'</p>'); 
        } 

    </script>
</head>
<body>
</body>
</html>