We inspect paper money bills in order to find one whose serial number ends in a "0". What is the probability that the 23th billl we inspect is the first one whose serial number ends in "0"? (Please answer to 4 decimals of accuracy.) Telephone calls arrive at a village exchange at an average rate of 19 per hour. Determine the probability that no calls arrive during a 10 minute period. 0.4635 0.885 0.0273 0.042