statistical ideas & methods

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suppose that the average number of years to graduate at a university is 4 years, with a standard deviation of 0.5 years. assume a bell-shaped distribution for years to graduate.

from the empirical rule, what is a range of values that 95% of the students should graduate between?
from the empirical rule, what is a range of values that 68% of the students should graduate between?
from the empirical rule, what is a range of values that 99.7% of the students should graduate between?
suppose that the average height for college men is 66 inches. if the height distribution is bell-shaped, and 95% of the men have heights between 60 inches and 72 inches, what is the standard deviation of heights for this population?
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