3.6 The shelf life, in days, for bottles of a certainprescribed medicine is a random variable having the densityfunction

F(x)={20,000/(x+100)^3, x>0,

         {0,                           elsewhere.

Find the probability that a bottle of this medicinewill have a shell life of

(a)   atleast 200 days

(b) anywhere from 80 to 120days.

Please show all steps to solve, not in booksshow