Mathematics, 10.11.2019 07:31 LigmaXD

44. how much do you study? a survey among freshmen at a certain university revealed that the number of hours spent studying the week before final exams was normally distributed with mean 25 and standard deviation 7. a. what proportion of students studied more than 40 hours? b. what is the probability that a randomly selected student spent between 15 and 30 hours studying?

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