(1) 從哪幾方面讓你得知此問題是計算binomial variable, 而非 Poisson？
(2) 0單交易？
(3) 1單交易？
(4) 2單交易？
(5) 3或更多單交易？
請附加多少的解說及算式輔助(中或英文不拘)，讓我容易明白，謝謝。
更新1:
(1) It is binomial distribution with the theory of either success or failure. Pls kindly answer number (2) to (5). Tks!
更新2:
REVISION! Sorry! It should be Poisson Variable (instead of binomial)! (1) So, pls kindly explain how u can discern its nature: Poisson?
更新3:
My classmate has explained that there is the wordings "on average" in the question. Thus, it is Poisson. So simple to discern?