Msc Statistics Acceptance and Questions

Hello! I was accepted into the Msc Statistics program and am currently weighing my options (all US universities). I will send an email to the department with some of my questions, but I thought this subreddit might help me paint a better picture:

1. What is the usual Msc Statistics cohort size? I haven’t found exact numbers online, though my best guess is from the 45-55 theses posted every year which is a nice number. 
   1. This matters somewhat as it informs me of the level of support/attention I might receive, though I admit it’s more applicable in the US.
   2. Side curiosity: do people drop out frequently? I.e. the cohort starts at 75 people then drops to 50 by graduation….
2. I’m not familiar with the European schedule, how do people fit internships into their studies when your only break time has exam requirements? I know not everyone does, but I’d like to complete one, so it might involve a semester leave.

My background: I have a bachelor’s from a US university, and work experience.

Very excited at the prospect of being at ETH in a couple months!