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Math·Problem-Solving and Data Analysis·Two-variable data: Models and scatterplots

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During an experiment, the temperature, in degrees Celsius ${}^{\circ }\text{C}$ of a mixture was recorded to the nearest integer at certain times. The scatterplot shows the recorded temperature $y$, in ${}^{\circ }\text{C}$ of the mixture $x$ hours after the start of the experiment. What was the average rate of change of the recorded temperature of the mixture over time, in ${}^{\circ }\text{C}$ per hour, from $x=1$ to $x=3$?

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