Have you enabled new analytics in the Settings for the course?
Settings --> Feature Options
Click on the red x next to "New Course and User Analytics" and it'll present a popup to enable or disable.
This allows the teacher to see high, low, average, and the teacher can message students who have the "missing" or late." Hovering over the bar graph presents the number of students and names of the students in that grade range.
This supplements the "Report" in the "Build" area ... which provides some interesting information.

Please don't get me wrong, the analysis in new quizzes is weak at best. I'm not sure why I can't simply hover over the assignment in the gradebook and get the high, low, and average in a popup. There should also be a simple report which states, these were the top x number of missed questions.