Suppose that I look at ten sections (350 students) of Keller classes over the pas

Suppose that I look at ten sections (350 students) of Keller classes over the past couple of sessions, and determine that, on the average, 15% of the students in those classes wanted to take MATH533 the following session.

Construct a 95​% confidence interval for the true percentage of students who want MATH533 next session.

Bonus question: There are currently 6325 students enrolled in Keller for September 2018. If each MATH533 class has a max enrollment of 40, what is the fewest number (with 95% confidence) of MATH533 sections that we should run in November 2018