(a) For young people, causes of death are related mostly to accidents. Proceeding from this, explain why the assumption of the approximate constancy of μ(x) may look reasonable for x’s between 30 and 40 years.

(b) For what x’s do we need to know values of μ(x) to compute the probability that a thirty year old person will survive 40 years? Which formula shows it explicitly? Relate this question to part (a).