For a 4-units class like Statistics, students should spend average of 12 hours per week studying for the class. A survey was done on students, and the distribution of total study hours per week is bell-shaped with
a mean of 15 hours and a standard deviation of 3 hours.
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Use the Empirical Rule to answer the following questions.
and
hours on this
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a) 68% of the students spend between
class.
b) What percentage of the students between 6 and 18 hours on this class?
c) What percentage of the students above 9 hours?