[問題] 考古題不會寫求助消失
Let X1,X2...Xm be m indepedent random variables with
values in N union { 0 } and with commom distribution
P { X = k }= Pk, Define Rn = sum(Pk), k = n,...無窮
Show that
E[min(X1,X2...,Xm)] = sum(Rn)^m, n = 1,2...無窮
解答寫:
E[min(X1,X2...,Xm)] = sum(P{min(X1,X2,...,Xm)>=k})
這是為什麼,看不出端倪求解版上大神們!
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