(a(i))[2]
Find $k$.
(a(ii))[1]
Find the modal value of $X$.
(a(iii))[3]
Find the probability that Sarah receives more phone calls on a given day than the mean number of calls per day.
Mathematics 9709 · AS & A Level · The Poisson distribution
The Poisson distribution — practice question
Sarah gets $X$ phone calls per day, and the probability distribution is given below.
Worked solution & mark scheme
This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Since probabilities must add to 1: $0.24 + 0.35 + 2k + k + 0.05 = 1$” …
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