<!DOCTYPE html>
<script>
'use strict';
var X = [3, 4, 10, 25];
function E(x) {
var sum = 0; //summation
var n = x.length; //element cnt
for (var i = 0; i < n; i++)
sum = sum + x[i];
return sum / n; //average
}
// display average
document.write('m 평균 = ' + E(X) + '<br />');
document.write('d1 편차 = ' + (X[0] - E(X)) + '<br />');
document.write('d2 편차 = ' + (X[1] - E(X)) + '<br />');
document.write('d3 편차 = ' + (X[2] - E(X)) + '<br />');
document.write('d4 편차 = ' + (X[3] - E(X)) + '<br />');
</script>