The "Quality probabilities" tips & tricks entry has the table from the FFF showing the 10% quality odds (4x T3) as "10%, 1%, ..." which doesn't match the actual probabilities of "9%, 0.9%, ...".
Either the numbers in the table need to change, or some other text needs to change to reflect that the shown odds are the odds to get at least that quality.
Also, the basic Quality tips & tricks page does not state that you only ever get quality products by using modules, might be worth including that.