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If a student scores a 54% and is in the 90th percentile, how well did the class do?

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If the score is 54% and is in the 90% of the class it means that the average of the class was near the student's grade so the distribution of the grades is near 60%. Then, the class did not do well.

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Francisco, I guess I'm confused by the reply you gave to Alyssa, so let's help her out.

If I'm in the 90th percentile, it means that my score was better than 90% of the class. (That's the part that seems to trip up students.) If I'm in the 99th percentile, it means that I was basically better than everyone. If I'm in the 25th percentile, it means that I was only better than 25% of the class, so 75% of the class out-scored me.

In this problem, the student in question got a 54%, which sounds pretty awful, and they were in the 90th percentile. So, what does that mean? 90% of the class did worse than a 54%. Only 10% of the class got better than a 54%.

How does that mean that the average of the class was near the student's grade? The average could have been like a 30%, or a 40%, or maybe a 50% if lots of people were bunched there...but none of those gets "a distribution of the grades near 60%," and it doesn't mean that the average was near the student's grade necessarily.

What am I not getting?

-- Michael
The question was how well the class do/ and my answer is "class did not do well".
I am not interested in being involved in discussions that at the end gives us the same answer.
If the answer is different to mine please post it and we will discuss it.
 
Best regards
 
Your answer also said "the average of the class was near the student's grade."  I did not follow that comment.
Your answer also said "so the distribution of the grades is near 60%."  I did not follow that comment.
 
The Answers Resource is a place for us to help students gain a better understanding of the questions they pose, not for us to just spoonfeed answers.  I know you know this.  :)  So, just handing them an answer, if the path to the answer isn't clear or isn't even right, is critical to the value we provide to our students.
 
I am asking for clarification on how you got to your answer so we can help Alyssa see the logic behind the answer, so she can deepen her understanding rather than just copy your end result.
 
So, are you willing to help us understand those other statements you made in your response? 
 
Thanks for the assist.