public function getRandInt(_min:Number, _max:Number):int
{
  return _min + Math.round(Math.random()*(_max - _min));
}

public function getRandNum(_min:Number, _max:Number):Number
{
  return _min +Math.random()*(_max - _min);
}

Functions that returns a number between min & max, as integer or decimal.

Random Number Between Max and Min

ActionScript 3