View Single Post
Old 09-12-2013, 06:11 AM
magdon's Avatar
magdon magdon is offline
Join Date: Aug 2009
Location: Troy, NY, USA.
Posts: 597
Default Re: Stuck on Problem 1.7

First you need to compute the probability that any one specific coin has nu=0. Call this probability P. Now the number of coins that have nu=0 is itself a binomial distribution with probability P.

You can use the above observation, or you can use a trick: the probability that at least one coin has nu=0 is related in a simple way to the probability that all coins have \nu\not=0

Originally Posted by i_need_some_help View Post
On part (a), I tried a few different things. Most recently, 1 - binomcdf(1 to 10 | N, mu) ^ (number of coins), but this doesn't seem to be correct.

In the case where mu is 0.05 and we try with one coin, the probability should be 1 - 0.05**10. I can't figure out how to generalize that to multiple coins.

Have faith in probability
Reply With Quote