@Test
    public void test_getAverageStatistical() {

        List<Long> standardList = new ArrayList<Long>();

        long foo = 0;

        // filling list with values
        for (int i = 0; i <= 100; i++) {
            standardList.add((long) 5);
        }

        // calculating average value
        for (Long bar : standardList) {
            foo += bar;
        }
        Long standardAverage = foo / standardList.size();

        assertEquals("Fail - average values must be same", standardAverage, ex.getAverageStatistical(standardList));
    }