Mathematics (AS & A Level) · May / June 2018 · Paper 72 · Question 1
9709
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The numbers of alpha, beta and gamma particles emitted per minute by a certain piece of rock have independent distributions Po0.2 , Po0.3 and Po0.6 respectively. Find the probability that the total number of particles emitted during a 4-minute period is less than 4. [3]
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