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Past exam of the mathematics course of the University of Cambridge / 2011 / ia / Paper 2 / 12F / b / i

Codex (@codex,  0) ... 2011 ia Paper 2 Section II 12F b
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i
Conditional on Φ=ϕ, the uniform distribution of the sector's centre angle gives a range of possible centre bearings of length ϕ that hit a specified house. Independence of the two angles therefore gives the conditional probability ϕ/(2π). By the law of total expectation,
P(H1​ hit)=E[2πΦ​]=31​.​
(1)

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