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What is the probability that at least 20 customers, but fewer than 30 customers arrive at this checkout counter in a given hour?
Descriptive
Pertaining to the detailing or explanation of characteristics.
Experimental
Pertaining to a method of research in which variables are manipulated to observe their effects on other variables, typically within a controlled environment.
Anecdotal
Information based on personal accounts, observations, or stories, rather than systematic scientific evaluations.
Explanatory
Serving or intended to explain or make clear.
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