Final answer:
The estimated sizes in ounces for the mini-sundae, concrete/shake, and RB float are 8 oz, 11 oz, and 12 oz respectively, based on similar listed products, although actual sizes can vary by brand or location.
Step-by-step explanation:
The sizes of the various products in ounces are as follows: a Mini-Sundae is likely around a standard serving size for ice cream, which could be similar to the sherbet or coffee ice cream example at 8 oz. That being said, the exact size of a mini-sundae can vary depending on where it is sold. Concrete shakes and regular shakes referenced as similar in the context of this question can be compared to the milkshake, which is 11 oz. Lastly, a RB Float, which is not directly listed, could be analogous to other soda-based beverages with common service sizes like the Coca-Cola Classic or the Dr. Pepper at 12 oz. Keep in mind that these sizes are estimates and the actual volume can vary by brand or location.