Welcome to Net54baseball.com. These forums are devoted to both Pre- and Post- war baseball cards and vintage memorabilia, as well as other sports. There is a separate section for Buying, Selling and Trading - the B/S/T area!! If you write anything concerning a person or company your full name needs to be in your post or obtainable from it. . Contact the moderator at leon@net54baseball.com should you have any questions or concerns. When you click on links to eBay on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network. Enjoy!
Statistically, the ratio of any one card should be equivalent to the ratio of the whole set.
This is, of course, unless there are specific cards from each set that are much easier or much more difficult than normal.
So assuming that your ratio is correct for the set, then either your Nadja Plank is more common than normal or the script and blank backed Planks are much tougher than normal.
Of course, all of this is just to yank your chain :D