yanling's answer to Dhruv Patel's International Baccalaureatte Maths HL question.

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yanling
Yanling's answer
1 answers (A Helpful Person)
Poisson distribution is for modelling events that happen or do not happen. (i.e with probability p or 1-p)

As to part b, do remember to omit 0 and 9. Sum up the other numbers in between them.

Let me know if you need more details. :)