I have a 88.4 average in my Algebra 1 class. I just got a bad grade on my test; 65.5. What is my current grade now? -KermitPiggyBear
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it depends how many tests/homeworks/whatever your 88.4 average is based on if it's based on $n$ grades then your average is now $avg=\dfrac{88.4 n + 65.5}{n+1}$
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