In a survey of 2035 workers, 73% reported working out 3 or more days a week. what is the margin of error? what is the interval that is likely to contain the exact percent of all people who work out 3 or more days a week?

At least two people have the same birthday in a school of 150 students

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?

Explain why the factor 1.5 is broke. into two numbers in the model.