Let X1 X2 X999 be iid uniform random variables on the in

Let X1, X2, . . . , X999 be i.i.d. uniform random variables on the interval [?1/2, 1/2]. Let X(500) be the empirical median, that is X(500) = Xk for some k such that for exactly 499 indices j != k we have Xj < Xk and exactly 499 indices j != k we have Xj > Xk.

1. Find an approximation for P(X(500) > 0.01).

2. What is the probability that X(500) = X1?

Solution

Let X1, X2, . . . , X999 be i.i.d. uniform random variables on the interval [?1/2, 1/2]. Let X(500) be the empirical median, that is X(500) = Xk for some k such

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