Pulses arrive at a Geiger counter in accordance with a Poisson process at a rate of three arrivals per minute. Each particle arriving at the counter has a probability $\frac{2}{3}$ of being recorded. Let $X(t)$ denote the number of pulses recorded by time $t$ minutes. (a) $P[X(t)=0\}=?$ (b) $E[X(t)]=$ ?
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