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Problem 15 - Entrance Test

A geological survey has collected data on the percentage composition of different minerals found in a rock sample (e.g., Quartz: 35%, Feldspar: 25%, Mica: 15%, Other: 25%). Which type of graph would best represent this data to clearly show the proportion of each mineral relative to the total rock sample?

Correct: C

A pie chart is ideal for displaying parts of a whole, showing the percentage or proportion of each category within a total. Since the data represents the percentage composition of minerals in a rock sample, a pie chart would effectively illustrate how each mineral contributes to the overall composition of the rock, making it easy to compare the relative amounts. Line graphs are for trends over time/continuous variables, bar graphs for comparing distinct categories, and scatter plots for relationships between two continuous variables.