[ Reply | Next | Previous | Up ]
From:
Remote Name: 69.192.119.113
Date: 20 Mar 2005
Time: 00:18:56 -0700
The mean of Geometric Distribution(a) is (1-a)/a, not 1/a. In this problem, the mean is (1-1/6)/(1/6) = 5. In words, you should count only the number of FAILURES before the success.