What is the probability that there is an unusual number of speeches on any given day?

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Each time parliament convenes there is enough time for 12 speakers on each day on average.

Legislation period lasts for 5 years

Each year there are 4 seassion of 3 calender months and in each session there are exactly 60 days in which parliament convenes.

Question

What is the probability that there is an unusual number of speeches on any given day? What is the probability that there is an unusual number of unusual days in a given session?

My Attempt

i believe this is the poisson distribution and i thing Lambda = 300 however i am not sure what to do

please help me

Thank you