public int getAverage(final String callName) {
		float avg = -1;
		final List<CallData> callDataList = getCallData(callName);
		for (final CallData callDataEntry : callDataList) {
			if (avg == -1) {
				avg = callDataEntry.getDuration();
			} else {
				avg = (avg + (float)callDataEntry.getDuration()) / (float)2;
			}
		}
		return (int) avg;
	}