Expectation of random 2d walk
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Start at the origin, take $n$ independent steps of length 1 in the direction of $theta_i$ , which is uniformly distributed on $[0,2pi]$ . If $X,Y$ is the position after $n$ steps and $D = X^2 + Y^2$ , what is $E[D]$ ?
probability probability-distributions
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edited Nov 20 at 3:35
asked Nov 18 at 4:11
user616954
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