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

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 to estimate the mean. (b) Use the Empirical Rule to estimate the
standard deviation. (c) Why is the assumption of a normal, bellshaped
distribution important in making these estimates? (d) Why might caffeine
content of coffee not be normal? (Data are from Popular Science 254, no. 5 [May
1999].)

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