MATH 1300 Curve

What is the average curve for MATH 1300? One of the LA's told me that in her experience an 89% was curved to an A. I thought that sounded too generous to be true. In order of the first to third midterm, the average scores were 77.3%, 77.9%, and 58.9%. So the average of the 3 midterms is 71.4%, which seems to be just slightly below what they are looking for. What do you think I should expect for a curve if any?

​

Edit: I forgot to mention that they will replace our lowest midterm with our final if we do better on the final.

2nd Edit: The final came back with an average score of 68.3%. Where does that put us for a curve?