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The atoms of a radioactive element are randomly disintegrating If every milligram of this element, on average emits 3.9 alpha particles per second 2022/09 8

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The atoms of a radioactive element are randomly disintegrating If every milligram of this element, on average emits 3.9 alpha particles per second 2022/09 8 (a) Find he probability that the number of particles emitted from 1 milligram is at most 2. (b) Find the expected number of alpha particles emitted during two millisecond period

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