1. The hawk eating the birds represent _________ trials with parameters (success probabilities) p1, p2 and p3 depending on the number of birds. The values for these parameters are ___, ___ and ___.
2. The waiting time for a hawk to successfully eat a bird when there are k birds is a random variable Xk with a _________ distribution with parameter ___. The mean of this distribution is ___.
3. The time X it takes to eat all three birds is the sum of the three random variables X1, X2 and X3. The mean of a sum of random variables equals ___ ___ __ ___ _____. So the mean of X is ___.