??      count-sum.php     
<html>
<head>
<title>6.2??????????????</title>
</head>

<body>
<h3>6.2??????????????</h3>
<h4>count.php???</h4>

<?php

$tokuten = array(
52,29,58,98,100,91,27,51,92,85,61,90,75,14,12,95,61,90,47,12,94,7,15,14,95,61,97,59);

#?50??????????????
$count1 = 0;
foreach($tokuten as $t){
if($t >= 50) { #50???????
$count1++;
}
}
#?10???30????80??????????
$count2 = 0;
foreach($tokuten as $t){
if($t >= 80 && $t >= 10 || $t <= 30) { #
$count2++;
}
}
#????????

$sum = $tokuten[0]+$tokuten[1]+$tokuten[2]+$tokuten[3]+$tokuten[4]+$tokuten[5]+$tokuten[6]+$tokuten[7]+$tokuten[8]+$tokuten[9]+$tokuten[10]+$tokuten[11]+$tokuten[12]+$tokuten[13]+$tokuten[14]+$tokuten[15]+$tokuten[16]+$tokuten[17]+$tokuten[18]+$tokuten[19]+$tokuten[20]+$tokuten[21]+$tokuten[22]+$tokuten[23]+$tokuten[24]+$tokuten[25]+$tokuten[26]+$tokuten[27];
$avg = $sum/28;

#????????????

$count4 = 0;
foreach($tokuten as $t){
if($t >= $avg) { #
$count4++;
}
}

#???????

$count5 = ($count4/28)*100;

 

echo "?50????????????? $count1 ????<br />\n";
echo "?10???30????80???????? $count2 ????<br />\n";
echo "???? $avg ???<br />\n";
echo "? $count4 ?????????<br />\n";
echo "?????? $count5 ????<br />\n";

?>

</body>
</html>