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Find the z-score for which the area to its right is 0.14. How much do you study? A survey among freshmen at a certain university

Find the z-score for which the area to its right is 0.14.

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.

What proportion of students studied less than 30 hours?

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