- #1

Callix

- 106

- 0

1. Homework Statement

1. Homework Statement

An instructor who taught two sections of statistics last term, the first with 20 students and the second with 35, decided to assign a term project. After all projects had been turned in, the instructor randomly ordered them before grading. Consider the first 15 graded projects.

What is the probability that exactly 10 of these are from the second section?

__ANS__: 0.2392 where N=55, M=15, n=35

## Homework Equations

n/a

## The Attempt at a Solution

I disagree with this.. I thought that the number of observations is denoted by n, which should equal 15 because we are observing 15 of the projects. M would be the subset, which, since it's asking with regards to the second section, should be 35. So why is M and n flipped in this scenario??

Later in my homework, one of the solutions to the questions even uses a hypergeometric distribution that specifically shows that n=# of observations and m=amount in a subset of N...

Here is a screenshot of said question:

Which question has the wrong "correct" answer then?

Maybe I'm just misinterpreting the questions?

Any help is greatly appreciated! :)