Histogram in a Rainstorm

One of my 8th grade science students produced a histogram of the class data for an experiment conducted in class. The purpose of the experiment was to determine if the mass changed when copper and sulfur were heated in a closed system. In the histogram, you can see that frequency is on the y-axis and change of mass in grams on the x-axis.There is a strong central tendency around 0.00 g indicating that there is no change in mass.

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