Originally Posted by

**dojo** Hi, I've got a question but before I can get going I need to tabulate the probabilities and am coming unstuck early on...

Q:

Finding 4 coins in his pocket, Al proposes a game of chance. He will toss all 4 coins; let *X* denote the number of heads obtained. Penny will then toss all the coins which came up tails when Al tossed them. Let *Y* denote the number of heads Penny obtains.

What formula would I use to find the joint probability? Is it conditional as Y is dependant on X?

Maybe someone could help with this ( for example X = 4 Tails and Y= 4 Tails or some other so I can get the idea...)

Your help is appreciated

Dojo

Thanks