On Jun 11, 1:27 pm, tutorny <tuto...@gmail.com> wrote: > Thanks so much for your reply! > > > I read that as the probability that 30 or more leave. You've apparently > > read it as the probability that 30 or fewer leave. The longer I look > > at the question, the less sure I am which of us is correct. > > A lot of us in the class had issue with the wording of the problem. > We emailed the professor, and she said that the correct understanding > is "30 or fewer leave" or P(x <=30), so that's what I've been working > with.
My answer is based on the assumption that the professor wanted P(x>=30).
If this is what she meant, I don't think she's using the phrase "as many as" correctly. Your approach is correct for what is apparently the correct interpretation.