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(a) The change in mortality risk against age relates to parameter c in the Weibull model, with a decreasing mortality risk (c < 1), constant mortality risk (c = 1), decelerated increase in mortality risk (1 < c < 2), linear increase in mortality risk (c = 2), and accelerated increase in mortality risk (c > 2). (b) The change in mortality risk against age relates to the parameter λ in the Gompertz model, with the more accelerated increase in mortality risk for a larger λ value
