Veronica teaches french in groups of four students. she rents a room for $200 per month. she charges $45 per hour per student. veronica teaches seven groups of students, and her net earnings per month are $6,100. if each student learns french for the same number of hours, write an equation that can be used to calculate the number of hours each student learns french in a month.

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?