This is the sample script to use the class

import druva.ArrayUtils;

var arr:Array=new Array(0,1,2,3,4,5);

trace(ArrayUtils.insertAt(arr, 1, 10));

Actual Class to calculate average of numbers in array

package druva{
//@ Author Druva

import flash.display.Sprite;

public class ArrayUtils extends Sprite {
public function ArrayUtils() {
}

//@ return new array with inserted element;
public static function insertAt(ar:Array, index:Number, element:*):Array {
index = (index > ar.length) ? ar.length : index:Number;
return ar.slice(0,index).concat(element).concat(ar.slice(index));
}

}
}