<PRE><B>Question 481028</B>
Following are the American College Test (ACT) scores attained by the 25 members of a local high school graduating class: 
21 24 23 17 31 19 19 20 19 25 17 23 16
21 20 28 25 25 21 14 19 17 18 28 20 
Find P5, P10, and P20 for the ACT scores.

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Put the numbers in ascending order.
There are 25 numbers.
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P5: Find the number that has 5%*25 = 1.25
Round up to the 2nd number in the order.
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P10 = ?
10%*25 = 2.5
P10 = the 3rd number in the order
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P20 = ?
20%*25 = 5
Take the average of the 5th and the 6th number in the order.
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Cheers,
Stan H.</PRE>