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meerkat18
To present his data on the solubility of three different salts in water at 22°C, bar graph should be used since there are different salts and the only variable is the type of salt used. Line graph and scatter plot use two coordinates or variables and is common to comparing data using the same sample while using histogram to find out data distribution is irrelevant.
taskmasters
bar graph should be a perfect choice for Roy for displaying his data. The correct option among all the options that are given in the question is the first option. This is because only a single variable is present and that is the kind of salt that is being used by Rob. I hope the answer has come to your help.

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