<?php
$connect=mysqli_connect('localhost','root','','baza');
$question="SELECT cena FROM dania WHERE typ=1;";
$howmuch=mysqli_num_rows($query);
$counter=0;
$query=mysqli_query($connect,$question);
while($row=mysqli_fetch_array($query)){
$counter=$counter+$row[0];
}
$counter2=$counter/$howmuch;
echo round($counter2,2)."zł";
 ?></p>