JAMB Mathematics 2023 Paper

Concept:Significant figures are the meaningful digits of a number. In a whole number without a decimal point, trailing zeros are only placeholders, so they are not counted.Explanation:The population is given as approximately $5{,}020{,}700$, which has no decimal point. Write the number without commas as the digit string $5020700$. The last two zeros are trailing zeros, so they are not significant. This leaves the digits $50207$. The zero between $5$ and $2$ is significant because it lies between nonzero digits. The zero between $2$ and $7$ is also significant for the same reason. Therefore, the significant digits are $5$, $0$, $2$, $0$, and $7$. Counting them gives $5$ significant figures.Answer:D. $5$ significant figures