A class of twenty students was given an assignment worth 50 points the score of the students are shown here

Question

22 25 27 27 30    31 32 34 35 36

37 37 38 39 39     40 41 44 47 47

 

if erins score was 41points what was her percentile rank in the class

Answer 1

Hi Kyrsten--

 

Percentile rank takes the top score in the class and makes it "the new 100 %"

 

So in this case, "47 is the new 100."

 

So to calculate the percentage, you say that 41 out of 47 is equivalent to SOME NUMBER out of 100.

 

Set it up as a proportion: 41/47 = x/100

 

47x = 4100; x = 4100 ÷ 47 = 87.23 % (so that's Erin's percentile class ranking)

 

Or simply divide 41/47, which gives you .8723, and just remember to express that as a percentage: 87.23%

 

Hope this helps!

 

Matt in New York