Posted by **Lori** on Wednesday, August 8, 2012 at 10:29am.

A graduate class consists of six students. What is the probability that exactly three of them are born either March, June or November?

- Probability and Stats -
**MathMate**, Wednesday, August 8, 2012 at 6:14pm
Out of six students, we need exactly 3 fit the criteria of being born in 3 months out of 12, i.e. with probability p=3/12=0.25.

Since the probability is assumed constant throughout, and we know the total number of students, we can use the binomial distribution, where

n=6

x=3

p=0.25

and the probability is given by:

P(X=x)=C(n,x)p^x (1-p)^(n-x)

where C(n,x)=binomial coefficient = n!/(x!(n-x)!).

Just plug in the numbers to get your results.

## Answer This Question

## Related Questions

- universsity of karachi - A graduate class consist of six students. what is the ...
- Stats - Suppose that you are in a class of 31 students and it is assumed that ...
- math check - Posted by Nora 56 on Sunday, June 2, 2013 at 7:32pm. Sorry to ...
- STATISTICS - Suppose that you are in a class of 29 students and it is assumed ...
- Statistics - Suppose that you are in a class of 31 students and it is assumed ...
- Probability - The newest invention of the 6.041x staff is a three-sided die. On...
- random assignment-stats - Would this correctly result in random assignment? A ...
- random assignment-stats - Would this correctly result in random assignment? 1. A...
- Math check answer - Suppose that you are in a class of 31 students and it is ...
- math check - Suppose that you are in a class of 31 students and it is assumed ...

More Related Questions