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Radioactive mass 1 emits particles at a mean rate of Î»_{1}per second, and radioactive mass 2 emits particles at a mean rate of Î»_{2}per second. Mass 1 is selected with probability p, and mass 2 is selected with probability 1 âˆ’ p. Let X be the time at which the first particle is emitted. It can be shown that X has a mixed exponential distribution with probability density function

a. Find Î¼_{X}.

b. Find the cumulative distribution function of X.

c. Let Î»_{1} = 2, Î»_{2} = 1, and p = 0.5. Find P(X â‰¤ 2).

d. Let Î»_{1} = 2, Î»_{2} = 1, and p = 0.5. Given that.

P(X â‰¤ 2), find the probability that mass 1 was selected.

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