Consider a discrete random variable XXX where P(X=k)=1/nP(X=k) = 1/nP(X=k)=1/n for k=1,2,…,nk=1, 2, \dots, nk=1,2,…,n. What is the mean E[X]E[X]E[X]?
(n+1)/2(n+1)/2(n+1)/2
n/2n/2n/2
nnn
(n−1)/2(n-1)/2(n−1)/2