statistics 問題
The number, X, of fatal accidents occur at random at a known "black spot" is a Poisson process with mean 4 per yr.The number, Y, of non-fatal accidents at the same place may be assumed to be Poisson random variable with mean 12 per year, and X and Y are independent.
1. State the distribution of V=X+Y and write down the mean and variance of V
2. Given that there were in total 20 accidents one year, find the probability that 5 ofthese were fatal
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