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Homework Help: Probability and matlab

  1. Oct 21, 2011 #1
    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. jcsd
  3. Oct 21, 2011 #2

    Ray Vickson

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    Science Advisor
    Homework Helper

    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?

  4. Oct 21, 2011 #3
    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.
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