Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » Courses » ap-stat

Topic: [ap-stat] Another birthday probability question ...
Replies: 0  

Advanced Search

Back to Topic List Back to Topic List  
Heather Kreider

Posts: 8
Registered: 3/16/11
[ap-stat] Another birthday probability question ...
Posted: Jun 28, 2012 9:48 AM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

Good morning all,

A couple of days ago I logged into Facebook to see that 4 of my friends all had a birthday that day. Being the nerd that I am, I immediately tried to figure out the probability of this occurrence out of my total of 493 friends. I have run through a couple of scenarios, (binomial and 493 simultaneous independent events) both of which have much smaller probabilities than I would have thought. I also tried applying the birthday paradox logic, but just confused myself, so I thought I would throw it out there for some summer fun. Might I pick your brain for how I would find the probability that exactly four of my 493 Facebook friends would have a birthday on the same day?

Thanks for humoring me...

Heather Kreider
AP Statistics Instructor
Florida Virtual School
hkreider@flvs.net
Frequently asked questions(FAQ) http://mrmathman.com/faq
List Archives from 1994: http://mathforum.org/kb/forum.jspa?forumID=67
ap-stat resources: http://apstatsmonkey.com
---
To search the list archives for previous posts go to
http://lyris.collegeboard.com/read/?forum=ap-stat
To unsubscribe click here:
http://lyris.collegeboard.com/read/my_forums/
To change your subscription address or other settings click here:
http://lyris.collegeboard.com/read/my_account/edit



Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.