B birdman12345 Member 10+ Year Member 5+ Year Member 15+ Year Member Joined Nov 28, 2005 Messages 35 Reaction score 0 Points 0 Pre-Optometry Jun 23, 2006 #1 Advertisement - Members don't see this ad Question: What is the probability of 6 tails on 9 tosses of a fair coin? Answer: 21/128 HOW DO YOU GET THIS ANSWER????????????
Advertisement - Members don't see this ad Question: What is the probability of 6 tails on 9 tosses of a fair coin? Answer: 21/128 HOW DO YOU GET THIS ANSWER????????????
C checkamundo Don't know what i'm doing 10+ Year Member 5+ Year Member 15+ Year Member Joined Jul 11, 2005 Messages 119 Reaction score 0 Points 0 Jun 23, 2006 #2 birdman12345 said: Question: What is the probability of 6 tails on 9 tosses of a fair coin? Answer: 21/128 HOW DO YOU GET THIS ANSWER???????????? Click to expand... You have to use this eqn: N!/M!(N-M)! x P^M x (1-P)^(N-M) where M= # of successes in N trials and P= probability of occurance So for your problem, the probability of throwing heads or tails = P= 1/2 9!/6!(9-6)! x (1/2)^6 x (1-1/2)^(9-6) Upvote 0 Downvote
birdman12345 said: Question: What is the probability of 6 tails on 9 tosses of a fair coin? Answer: 21/128 HOW DO YOU GET THIS ANSWER???????????? Click to expand... You have to use this eqn: N!/M!(N-M)! x P^M x (1-P)^(N-M) where M= # of successes in N trials and P= probability of occurance So for your problem, the probability of throwing heads or tails = P= 1/2 9!/6!(9-6)! x (1/2)^6 x (1-1/2)^(9-6)
