Assume that we are making raisin cookies. We put a box of 600 raisins into our dough mix, mix up the dough, then make from the dough 500 cookies. We then ask for the probability that a randomly chosen cookie will have 0,1,2,… raisins. Consider the cookies as trials in an experiment, and let X be the random variable which gives the number of raisins in a given cookie. Then we can regard the number of raisins in a cookie as the result of n=600 independent trials with probability p=1/500 for success on each trial. Since n is large and p is small, we can use the Poisson approximation with λ=600(1/500)=1.2. Determine the probability that a given cookie will have at least five raisins.