# Answer to Question #778 in Statistics and Probability for Valerie

Question #778

What is the difference between X-chart and R-chart?

Expert's answer

The X-bar chart describes the changes of the mean or average over the time. It can be constructed by plotting an average value of each subgroup while R-chart is the range of each subgroup, i.e. subtraction of minimum value from the maximum one.

Usually, these charts are represented together.

Usually, these charts are represented together.

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