Find the probabilities of the following events. 1. Molecules leave a cell at rate = 0.3/s.

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Find the probabilities of the following events.
1. Molecules leave a cell at rate λ = 0.3/s. What is the probability that exactly two have left by the end of the third second?
2. Phone calls arrive at a rate of λ = 0.2/h. What is the probability that there are exactly five calls in 9 h?
3. Cosmic rays hit an organism at a rate of 1.2/day. What is the probability of being hit ten times in a week?
4. Dandelion seeds fall into a garden with an average density of 0.9/m2. What is the probability that three fall into a 4.0-m2 vegetable garden?
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