A mistake? But better :D

var students = [
];

function randomNumber(lowNum, highNum) {
    var answer = Math.floor(Math.random() * (highNum - lowNum + 1) + lowNum );
    return answer;
}

function randomTrack() {
    var track = Math.floor(Math.random() * (3 - 1 + 1) + 1 );
    if (track === 3) {
        track = 'Front-End development';
    } else if (track === 2) {
        track = 'Back-End development';
    } else {
        track = 'Graphic Designer';
    }
    return track;
}

function nameRandom(howMany) {

    var whatName = Math.floor(Math.random() * (howMany - 1 + 1) + 1);
    var nameArray = ['Corliss',  'Salina',  'Melissia', 'Shona',  'Edda',  'Taryn',  'Rosalina', 'Honey',  'Francine',  'Robyn'];
    whatName = nameArray[whatName];
    return whatName;
}

for (i = 0; i < randomNumber(5, 10); i++) {
    students.push(
        {
        name: nameRandom(randomNumber(1, 10)),
        track: randomTrack(),
        achievements: randomNumber(0, 10),
        points: randomNumber(0, 50) + '<br>'
        }
    )
}
var holder = '';
for (i = 0; i < students.length; i++) {
for (key in students[i]) {
      document.write('<b>', key, ': ', students[i][key], '</b>', '<br>');
    }
}