 Solution

ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2023/iii/paper-207/6/b/ii/solution

A

and

B

is exponential with rate

θ + ϕ

1/ (θ + ϕ)

. The expected total person-time at risk is

E [x_{+}] = \frac{n}{θ + ϕ} .

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