An appliance dealer wants to purchase a combined total of no more than 100 refrigerators and dishwashers for inventory. Refrigerators weigh 100 pounds each. Suppose that the dealer is limited to a total of 12,000 pounds. She also wants to have at least as many refrigerators as dishwashers. If a profit of $35 for each refrigerator and $20 on each dishwasher, how many of each should be purchased and sold to make the largest profit

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?