Amir what I meant by average is that there was no detail of the spread of listener preferences from which the type of listener average was calculated.That might have been quite an even and narrow bell curve or quite uneven and wide one.So it does not really show relative variability between individual listeners.
Full set of data is available in research papers from Dr. Olive. As are groupings. There is no bell shape to them. We are all remarkably similar in how we like uncolored sound (in blind/bias controlled testing). There are sure to be outliers but unless you know 100%, then better not think that.