- #1
marina87
- 22
- 0
Random walk or binomial??
Statement:
A drunk person wonders aimlessly along a path by going forward 1 step and backward 1 step with equal probabilities of ½. After 10 steps,
a) what is the probability that he has moved 2 steps forward?
b) What is the probability that he will make it to his front door within 20 steps before he collapses with the door being 6 steps in front of him.
My approach was to use Binomial in both cases:
a)10C2 (0.5)^10
b)20C6 (0.5)^20
Is that correct? I have been reading about random walk and they sometimes give another equation.
(10+2)/2=6 and thn the result is like this 10C6.
The result is not the same and then I start to have my doubts.
Can some one please tell me if my approach using binomial distribution is right?
Statement:
A drunk person wonders aimlessly along a path by going forward 1 step and backward 1 step with equal probabilities of ½. After 10 steps,
a) what is the probability that he has moved 2 steps forward?
b) What is the probability that he will make it to his front door within 20 steps before he collapses with the door being 6 steps in front of him.
My approach was to use Binomial in both cases:
a)10C2 (0.5)^10
b)20C6 (0.5)^20
Is that correct? I have been reading about random walk and they sometimes give another equation.
(10+2)/2=6 and thn the result is like this 10C6.
The result is not the same and then I start to have my doubts.
Can some one please tell me if my approach using binomial distribution is right?