Hypergeometric distribution

#1
Hi,

I hope you can help, i have an assignment i can not solve:

You proffessor in sample theory think that their is 400 students 2 years ago, where 20 of them who smoke. Now their i made an research in my class, and out the 25 asked, 2 people said that they smoke. Assume that those 25 student is simply randomly from the 400 students. Will you mean that more than 5 % smokes?

I know that i need to use an hypergeometric distribution, how do i find the solution?
 

hlsmith

Less is more. Stay pure. Stay poor.
#2
Have you answered comparable problems using other distributions (e.g., standard normal, etc.). If so, what concepts do you use?