You just went on a blind date and wanted to impress the girl by adding an 18% tip to the total cost of the meal. two dinners came to a total of $35.90. desserts cost $7.50 and beverages cost $6.60. what is the 18% tip going to cost?

You were told that the amount of time lapsed between consecutive trades on the new york stock exchange followed a normal distribution with a mean of 15 seconds. you were also told that the probability that the time lapsed between two consecutive trades to fall between 16 to 17 seconds was 13%. the probability that the time lapsed between two consecutive trades would fall below 13 seconds was 7%. what is the probability that the time lapsed between two consecutive trades will be between 14 and 15 seconds?