Answer:
9.1
Explanation:
If list A has an average of 9.5, then we can say that all of the terms are 9.5
If list B has an average of 8.3, then we can say that all of the terms are 8.3.
9.5*20 = 190
8.3*10 = 83
190+83 = 273. This is the sum of all of the terms in the 30-number list.
To find the average, we can divide 273 by 30, which equals 9.1.