The Life Expectance in Years of a certain brand of clock radio is a continuous random variable with probability density function. F(x) = {2/(x+2)^2 0 If x>=0 otherwise A) find the probability that a randomly selcted battery has a shelf life of 3 years or less B) find the probability that a randomly selected clock radio lasts from 6 to 12 years c) graph y=f(x) for [o,12] and show the shaded region for part (a).