Final answer:
The nominal height of a typical CMU (Concrete Masonry Unit) is the average of the minimum and maximum heights provided for the specific variety.
Step-by-step explanation:
The nominal height of a typical CMU (Concrete Masonry Unit) varies based on the variety. Let's consider the TG1 variety as an example. According to the provided information, the height of TG1 is given as 15.420+1.146 cm. This means the minimum height of TG1 is 15.420 cm and the maximum height is 15.420 + 1.146 cm, which is equivalent to 16.566 cm. So, the nominal height of a typical TG1 CMU is the average of the minimum and maximum heights, which is (15.420 + 16.566) / 2 = 15.993 cm.