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Michaela is baking chocolate chip cookies and oatmeal cookies for her Math class. She
conducted a survey to find the number of students who prefer each type of cookie. A total
of 8 students preferred oatmeal cookies and that represents 40% of her class. How many
students preferred chocolate chip cookies?

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?