The strength of a concrete structure designed to support a fixed load of 464 lb has the following…

The strength of a concrete structure designed to support a
fixed load of 464 lb has the following probability density function:

(c) If the load in part (a) is applied at random according
to a Poisson process with a mean occurrence rate of 0.01 per year, compute the
design life for a reliability of 0.99.