# Homework Help: Probability and matlab

1. Oct 21, 2011

### Bassalisk

1. The problem statement, all variables and given/known data
Write a code in MATLAB witch calculates the probability of having 2 students with same birth date, in group of lets say 15. Assumption: year has 365 days, and birth dates are uniformly distributed.

2. Relevant equations
3. The attempt at a solution

Now, i understand that this is a combination. We have 15 students, and 365 possible birth dates. So thats 36515. Those are all possible outcomes. Now I don't understand, how do you get the probability that 2 people have same birth date.

Please don't shoot at me the formula for binomial coefficients etc. I know there are formulas, I even have the solution, but I kinda don't understand it.

After we determine the analytical form of this problem, then I will try to code it into matlab. Although the main point of this is to get familiar with matlab and probability possibilities.

Keep in mind that I just started learning matlab, and this is my first exercise to code some probability into matlab.

Thank you

2. Oct 21, 2011

### Ray Vickson

You say "I even have the solution, but I kinda don't understand it." Well, what is the formula, and what don't you understand about it?

RGV

3. Oct 21, 2011

### Bassalisk

Since I am really new to this, I googled "probability two same", and stumbled upon birthday problem.

I understood it. It is in place.

How do I translate that into MATLAB? Do I simply put in the formula, and calculate it?

And in general, do you have any links, or recommendations, where statistics and probability is taken into matlab?

I am VERY new to this.

I have 4-5 more problems that I have to solve using simulations in matlab(all probability) and it would be inefficient to post each problem.