You estimate that your kitchen remodeling project will require an electrician for 30 hours, a plumber for 33 hours and a carpenter for 18 hours . If the electrician charges $34.75 per hour , the plumber charges $30.00 per hour and the carpenter charges $28.65 per hour, what is the expected cost of labor for the project ?

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?