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