In many settings, the "rules of probability" are just basic facts about percentages. The Graduate Management Admission Test $($GMAT$)$ website provides the following information about the geographic region of citizenship of those who took the test in $2018$: $1\mathrm{.}9\%$ were from Africa; $0\mathrm{.}3\%$ were from Australia and the Pacific Islands; $2\mathrm{.}4\%$ were from Canada; $14\mathrm{.}3\%$ were from Central and South Asia; $36\mathrm{.}1\%$ were from East and Southeast Asia; $1\mathrm{.}7\%$ were from Eastern Europe; $3\mathrm{.}2\%$ were from Mexico, the Caribbean, and Latin America; $2\mathrm{.}2\%$ were from the Middle East; $30\mathrm{.}3\%$ were from the United States; and $7\mathrm{.}6\%$ were from Western Europe.