standard_description: Recognize that a measure of center for a numerical data set summarizes all of its values with a single number, while a measure of variation describes how its values vary with a single number.
problem_activity: Watermelon is on sale for $4 per pound.
a.   How much would 5 pounds cost? 7.5 pounds? 12.8 pounds?
b.   Why do you think grocery stores show the price per 1 pound? How is it useful or efficient when determining the cost of differently sized watermelons?


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