Re: Tricky maths problem

From: Stephen J. Herschkorn (herschko_at_rutcor.rutgers.edu)
Date: 08/20/04 

Date: Fri, 20 Aug 2004 18:45:18 GMT

Tristan wrote:

>Johnny has a coin, he tells Billy that he will give him £10 every time he spins heads, but take £5 off him every time he spins tails. What are the chances that Billy will have a positive amount after 5 spins? And after 10 spins? After X spins?
>
Let N be the number of heads out of x spins. (Do Brits really spin
coins? Americans toss them). How large ust N be for Billy to have a
positve amount? What is the distribution of N? 

-- 
Stephen J. Herschkorn                        herschko@rutcor.rutgers.edu

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