harusnya begini

<?php

include("/koneksi.php");

// membuat awal dan header tabel
echo "<table style='border-collapse:collapse; ' border='1' bordercolor='#D18E78' width='100%'>";
echo " <tr>
<td style='background:#D39580; width:30px;' align='center'><b>Jurusan</b></td>
<td style='background:#D39580;width:150px;' align='center'><b>Jumlah</b></td>
</tr>";

// membaca semua data bidang
/*
$query = "SELECT * FROM tb_alumni";
$hasil = mysql_query($query);
*/
$query2 = "SELECT DISTINCT jurusan FROM tb_alumni";
$hasil = mysql_query($query2);


while ($data = mysql_fetch_array($hasil))
{

// mencari data
/*
$query2 = "SELECT DISTINCT jurusan FROM tb_alumni";
$hasil2 = mysql_query($query2);
$data2 = mysql_fetch_array($hasil2);
*/
$jurusan = $data['jurusan'];

// menghitung jumlah
$query2 = "SELECT count(*) as jurusan FROM tb_alumni WHERE jurusan = '$jurusan' ";
$hasil2 = mysql_query($query2);
$data2 = mysql_fetch_array($hasil2);
$jumlah = $data2['jurusan'];

echo "
<tr>
<td align='center'>$jurusan</td>
<td align='center'>$jumlah</td>
</tr>";

}
// membuat akhir dari tabel
echo "</table>";