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The total number of first-year students is $1.6$ million. The given pie chart is:

The distribution of a category variable is displayed using pie charts and bar graphs. Any set of quantities measured in the same units can be compared using bar graphs. It's a good idea to ask yourself, "What do I see?" when looking at any graph.

The distribution of categorical variables is displayed as a "pie" with slices scaled by the counts or percent for the categories. All of the categories that make up a whole must be included in a pie. The usefulness of any graph is determined by the information we seek. It's difficult to deduce numbers from pie charts. In this scenario, the essential percentage information is not reflected in the graph. The percentage of first-year students planning to major in business is approximately $15\%$, whereas the percentage of first-year students planning to major in social science is approximately $12\%$The business discipline accounts for around $15\%$of the total pie, whereas social science accounts for approximately $12\%$of the total. As a result, the approximate percentage of first-year students that plan to major in business is about 15% and the approximate percentage of first-year students that plan to major in social science is about $12\%$