Calculate the weighted average.
-Rafi enrolled in a class where attendance counted as $15 \%$ of the final grade, quizzes counted as $20 \%$, one midterm exam counted as $35 \%$, and the final exam counted as $30 \%$. Rafi earned $95 \%$ on attendance, $87 \%$ on the quizzes, and $86 \%$ on the midterm exam. If $90 \%$ is needed to earn a grade of $\mathrm{A}_{-}$, what is the minimum score Rafi needs to earn on the final exam in order to earn a final grade of $\mathrm{A}-$ ? Round to the nearest hundredth.
A) $60.83 \%$
B) $94.17 \%$
C) $110.83 \%$
D) $77.50 \%$

Question

Quizplus · Accepted Answer

To find the minimum score Rafi needs on the final exam, set up the equation for the weighted average: $0.15 \times 95 + 0.20 \times 87 + 0.35 \times 86 + 0.30 \times x = 90$. Solving for $x$, we get $x = 94.17\%$.

Calculate the Weighted Average 15%15 \%15% Of the Final Grade, Quizzes Counted As

Calculate the Weighted Average $15 \%$ Of the Final Grade, Quizzes Counted As