def METHOD_NAME(self) -> None:
    """Check the correctness of average when n == 1."""
    result = self.pq_a.pq_average([self.category])
    self.assertAlmostEqual(result["PQ"], 60.0)
    self.assertAlmostEqual(result["SQ"], 90.0)
    self.assertAlmostEqual(result["RQ"], 66.6666666666)