Question: 73. For the multinomial distribution (Exercise 17), let Ni denote the number of times outcome i occurs. Find (a) E[Ni]; (b) Var(Ni); (c) Cov(Ni ,

73. For the multinomial distribution (Exercise 17), let Ni denote the number of times outcome i occurs. Find

(a) E[Ni];

(b) Var(Ni);

(c) Cov(Ni , Nj);

(d) Compute the expected number of outcomes that do not occur.

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