Answer:
Anna's test average would be 85%.
Explanation:
To find the average, you have to do 66 + 90 + 99 to get an answer of 255. The next thing you do is divide 255 by 3 to get a final answer of 85%. :) I hope this helps! ^^
85
the mean is equal to=99+66+90=255
255รท3=85
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