Consider an experiment that consists of counting the number of -particles given off in a one-second interval

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Consider an experiment that consists of counting the number of

α-particles given off in a one-second interval by one gram of radioactive material.

If we know from past experience that, on the average, 3.2 such α-particles are given off, what is a good approximation to the probability that no more than two α-particles will appear?

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