Assume that each person's (unique) favorite animal is independently and equally likely to be one of 23 possibilities. For a group of 81 people: What is the expected number of animals that are the favorite of exactly 7 people? I got completely stuck at this weird question. I tried to calculate the probability that no animal is the favorite of 7 people, but this feels too complicated for me. Any help is appreciated.
2026-04-03 01:01:54.1775178114
find expected value of number of animals
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