Consider a random walk on the infinite line. At each step, the position of the particle is one of the integer points. At the next step, it moves to one of the two neighboring points equiprobably. Show that the expected distance of the particle from the origin after n steps is O(n2).

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4. Consider a random walk on the infinite line. At each step, the position of the particle is one of
the integer points. At the next step, it moves to one of the two neighboring points equiprobably.
Show that the expected distance of the particle from the origin after n steps is O(n/2).
Transcribed Image Text:4. Consider a random walk on the infinite line. At each step, the position of the particle is one of the integer points. At the next step, it moves to one of the two neighboring points equiprobably. Show that the expected distance of the particle from the origin after n steps is O(n/2).
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