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Question

State whether the following statement is true or false, and explain why. If a statement is false, state the true change. A high school reports that its students' SAT scores were down by $10 \%$ in one year. The next year, however, SAT scores rose by $20 \%$. The high school principal announces, "Overall, test scores have improved by $10 \%$ over the past two years."

Solution

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Answered 1 year ago

Step 1

1 of 3After the first change in SAT scores, the current SAT score $X$ will now be:

$\begin{aligned} X_1&=X\times(1-10\%)\\ &=X\times(1-0.10)\\ &=0.9X \end{aligned}$

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