Question

Ms. Donahue uses 4 essays as the basis for her grading. Each essay counts as a percent of the final average.

Answer 1

(85+90+80+100)/4 = 88.75. It's rounds off to 89

Answer 2

This is NOT the case of adding up the sums of scores and dividing by 4.

This is a weighted average where we take each score and multiply by its weight (% worth) and then do the sum. We finally divide by sum of percentage (10%+15%+25%+50%=100%=1).

So, weighted average = $\frac{(85*0.1)+(90*0.15)+(80*0.25)+(100*0.5)}{1} \\=\frac{92}{1}\\=92$

Joel's expected final average is D (92).

ANSWER: D