Grouping averages of students scores
<p>I have student list like below</p>

<pre><code>public class Student
{
    public string First { get; set; }
    public string Last { get; set; }
    public int ID { get; set; }
    public List&lt;int&gt; Scores;
}

List&lt;Student&gt; students = new List&lt;Student&gt;()
     {
         new Student { First = "a", Last = "aa", ID = 1, Scores = new List&lt;int&gt;() { 97, 92, 81, 60 } },
         new Student { First = "b", Last = "bb", ID = 2, Scores = new List&lt;int&gt;() { 75, 84, 91, 39 } },
         new Student { First = "c", Last = "cc", ID = 3, Scores = new List&lt;int&gt;() { 88, 94, 65, 91 } },

     };
</code></pre>

<p>How can I group students according to their score avarages?</p>
