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A counter registers pulses at an average of two per minute. Find the probability that at least 3 pulses are registered in a two-minute interval.

  1. A counter registers pulses at an average of two per minute.
  1. Find the probability that at least 3 pulses are registered in a two-minute interval.
  2. What is the expected number of pulses in half an hour?
  3. If 10 two-minute intervals are chosen at random, find the probability that exactly seven will register at least three pulses?

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