FAILED TO INSERT DATA FROM FUNCTION();

[siti nuraini abd kadir]

HELLO, I HAVE A PROBLEM TO INSERT DATA FROM OUTPUT FROM FUNCTION()...
I WANT TO STORE THE OUTPUT IN DATABASE, BUT FAILED TO INSERT...

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BELOW IS MY FUNCTION() CODE, academiaTotal.php
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<?php
$page = 'fkpacademia.php';

//connect db

function totalMac_ac1(){
$query1 = "SELECT AVG(MAC) FROM academia1";
$result1 = mysql_query($query1) or die(mysql_error());

while($row1 = mysql_fetch_array($result1)){
echo "".number_format($row1['AVG(MAC)'],1);

$sql = "INSERT INTO fkpacademia (MAC) VALUES ('$row1['AVG(MAC)']')";
}
}

---?>

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MY CALL FUNCTION fkpacademia.php
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<?php require 'academiaTotal.php' ?>

<? totalMac_ac1(); ?>



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MY PROBLEM NOW IS THE sql(INSERT, (AVG(MAC) output... )) NOT SUCCESS... NO DATA INSERTED IN fkpacademia table.. AND I WANT TO UPDATE ALWAYS (AVG(MAC) from academiaTotal )... (MEANS THAT fkpacademia only have 1 record of AVG(MAC)...)

hope anyone can help me...