A Geiger counter is struck by radioactive particles according to a homogeneous Poisson process with intensity (lambda=1)

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A Geiger counter is struck by radioactive particles according to a homogeneous Poisson process with intensity \(\lambda=1\) per 12 seconds. On average, the Geiger counter only records 4 out of 5 particles.

(1) What is the probability \(p_{\geq 2}\) that the Geiger counter records at least 2 particles a minute?

(2) What are mean value and variance of the random time \(Y\) between the occurrence of two successively recorded particles?

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