Question: Cells will mutate when hit independently by cosmic rays (at rate 0.3/day) or by X-rays (at rate 0.2/day). Cells are hit by rays for 1

Cells will mutate when hit independently by cosmic rays (at rate 0.3/day) or by X-rays (at rate 0.2/day). Cells are hit by rays for 1 week. Use random variables Mc, Mx, and N to describe the number of mutations caused by cosmic rays, X-rays, and both types of rays together. What are their distributions? Check that E(N) = E(Mc) + E(Mx) and Var(N) = Var(Mc) + Var(Mx).
Find the parameter A for the Poisson that describes the given process.

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