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Consider a random survivorship group consisting of two subgroup: (1) the survivors of 1,600 persons joining at birth (2) the survivor of 540 persons joining

Consider a random survivorship group consisting of two subgroup: (1) the survivors of 1,600 persons joining at birth (2) the survivor of 540 persons joining at age 10. An excerpt

from the appropriate mortality table for both subgroups follows:

xlx

040

1039

7026

If Y1and Y2are the numbers of survivors to age 70 out of subgroups (1) and (2), respectively, estimate a number c such that Pr(Y1+ Y2 > c) = 0.05. Assume the lives are independent and ignore unit corrections.

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