Rob measures the solubility of three different salts in water at 22°C. Which type of graph should he use to display his data?

Rob is comparing one measured value—the solubility—for each of three distinct salts. A bar graph is suitable for comparing values across separate categories; a histogram is for distributions of numerical data, while a line graph or scatterplot is better for showing relationships or trends between numerical variables. The correct choice is the bar graph.

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