Splitting a merged Poisson total

Two independent Poisson streams (rates 3 and 5 per hour) are merged. Given that the merged process produced exactly 8 arrivals in some interval, what is the expected number that came from the rate-3 stream?

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  1. Given the total, the split is Binomial with p=λ1/(λ1+λ2)p=\lambda_1/(\lambda_1+\lambda_2).
  2. E=n⋅3/8E=n\cdot 3/8.

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