.isWithin(ALLOWED_ERROR * sqrt(LONG_MANY_VALUES_SUM_OF_SQUARES_OF_DELTAS))
        .of(sqrt(LONG_MANY_VALUES_SUM_OF_SQUARES_OF_DELTAS / (LONG_MANY_VALUES_COUNT - 1)));
  }

  public void testMax() {
    assertThrows(IllegalStateException.class, EMPTY_STATS_VARARGS::max);
    assertThrows(IllegalStateException.class, EMPTY_STATS_ITERABLE::max);
    assertThat(ONE_VALUE_STATS.max()).isEqualTo(ONE_VALUE);

    assertThat(Longs.lastIndexOf(new long[] {2L, 3L, 2L, 3L}, 3L)).isEqualTo(3);
  }

  public void testMax_noArgs() {
    assertThrows(IllegalArgumentException.class, () -> max());
  }

  public void testMax() {
    assertThat(max(MIN_VALUE)).isEqualTo(MIN_VALUE);
    assertThat(max(MAX_VALUE)).isEqualTo(MAX_VALUE);
    assertThat(max(8L, 6L, 7L, 5L, 3L, 0L, 9L)).isEqualTo(9L);
  }

  public void testMin_noArgs() {