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public class WebRequestAnalyzer {
  // initial methods are unchanged

  public double getAverageBandwidth() { 
    return calculateAverageBandwidth( 0, 0);
  }

  private double calculateAverageBandwidth(int i, long bandwidth) { 
    if (i > requests.size()) {
      return bandwidth / requests.size();
    }
    synchronized (requests.elementAt(i)) {
      numberOfPages += requests.get(i).getBandwidth();
      return calculateAverageBandwidth(++i, bandwidth);  
    }
  }

  public double getAverageResponseTime() { 
    return calculateAverageResponseTime( 0, 0);
  }

  private double calculateAverageResponseTime(int i, long responseTime) { 
    if (i > requests.size()) {		 
      return responseTime / requests.size();
    }     
    synchronized (requests.elementAt(i)) {
      responseTime += requests.get(i).getResponseTime();
      return calculateAverageResponseTime(++i, responseTime);
    }
  }
}