The following data reflect the number of customers who test drove new cars each day for a sample of 20 days at the Redfield Ford Dealership. 
Given these data,what is the range?
Definitions:
Igneous
Igneous refers to a type of rock that is formed through the cooling and solidification of magma or lava, characterizing the first group in the classification of rocks along with sedimentary and metamorphic.
Radioactive Decay
The process by which an unstable atomic nucleus loses energy by emitting radiation.
Heat
The transfer of thermal energy from high-temperature to low-temperature objects.
Earth's Crust
The outermost layer of the Earth, consisting of solid rocks, and is subdivided into the continental and oceanic crust.
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