Question: Radioactive mass A emits particles at a mean rate of 20 per minute, and radioactive mass B emits particles at a mean rate of 25

Radioactive mass A emits particles at a mean rate of 20 per minute, and radioactive mass B emits particles at a mean rate of 25 per minute.
a. What is the probability that fewer than 200 particles are emitted by both masses together in a five minute time period?
b. What is the probability that mass B emits more particles than mass A in a two-minute time period?

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