Find the indicated probabilities.
1. A coffee machine outputs a mean of 8 ounces. The machine's output is normally distributed with a standard deviation of 1 ounce. If the coffee cups hold 9.5 ounces, find the probability that the machine will overfill a cup.
2. The lifetime for a certain brand of incandescent light bulbs is normally distributed with a mean lifetime of 480 hours and standard deviation of 40 hours. What percent of these light bulbs last at least 500 hours?