twistedbeats
02-16-2005, 10:42 AM
Warning, i dropped prob and stat.
1)if the odds of an event happening are 1 in 8, what are the odds of it not happening in 13 tries:
(7/8)^ 13 = .17624
2) what are the odds of the same event happening exactly two times in 18 trials
(1/8)^2 * (7/8)^16 * 18 choose 2= .282254
1)if the odds of an event happening are 1 in 8, what are the odds of it not happening in 13 tries:
(7/8)^ 13 = .17624
2) what are the odds of the same event happening exactly two times in 18 trials
(1/8)^2 * (7/8)^16 * 18 choose 2= .282254