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A principal measures the weight of different numbers of textbooks that he finds in a storage room. The scatter plot below shows the relationship between the weight, in pounds, and the number of textbooks. A line of best fit is drawn on the scatter plot.

A scatter plot titled Weight of Textbooks with x-axis labeled Number of Textbooks and y-axis labeled Weight in pounds shows 20 data points with a strong linear association. A line of best fit drawn through the data passes through points with the coordinates (0, 0), (5, 12), and (10, 24).

Enter the slope of the line of best fit as a decimal to the nearest tenth.

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