Midterms: our 2nd midterm is on May 28. 1st midterm histogram is below.

This shows each score from the midterm of April 23.
The grade breakdown for 139a is in the first post of this blog. For this one exam, as a rough guide, 87 and above is roughly A range, 78 and above is roughly B range,  55 and above is roughly C range. That encompasses all the pluses and minuses. Overall, I would say this is an excellent class.