<PRE><B>Question 178741</B>
20,22,22,19,22,50,24,15,34,43,22,20,17,38,18,21,21,23,18,23 
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1st; Put the numbers in order least to greatest
2nd: Count the numbers = 20
3rd: 20% of 20 = 0.20*20 = 4
4th: find the 5th number in the list counting from the least
That is the 20$ile number
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5th: 0.75*20 = 15
6th: find the 16th number in the list counting from the least
That is the 75%ile number
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Cheers,
Stan H.</PRE>