1 dimensional random walk example binomail distribution step either right or

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A 1-dimensional random walk is an example of a binomail distribution, with a step either to the right or to the left being equally probable. Suppose out of N = 5 steps, x=3 steps are tot he right with p = 0.5 and q = 0.5. Answer the following questions: Use (5) to find the number of steps to the right (of the total of 5 (3) steps. What is the probability that 3 steps are to the right? Calculate the mean number of steps to the right: Find the variance: What is the standard deviation:
 
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