The mean number of serious accidents in a large factory is 5 per year, where the occurre independent of each other. X: number of accidents per year 1. find the probability that in the next year then will be exactly 3 accidents 2. in next year there will be no more than 4 accident 3. in the next two years, there will be exactly 2 accidents 4. in the next 3 months, then will be no accidents

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