Caffeine content in a 5-ounce cup of brewed coffee ranges from 60 to 180 mg, depending on

Question:

Caffeine content in a 5-ounce cup of brewed coffee ranges from 60 to 180 mg, depending on brew time, coffee bean type, and grind.
(a) Use the midrange as a measure of center.
(b) Use the Empirical Rule to estimate the standard deviation.
(c) Why is the assumption of a normal, bell-shaped important in making these estimates?
(d) Why might caffeine content of coffee not be normal? Distribution
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