I had to find the 20th percentile with the following data.    0, 1, 2, 2, 2, 3, 4, 4, 4, 8..... My first answer was 1.8. I got that by doing .20(10) = 1.8. This answer was wrong. I rounded up to 2 and that was also wrong. Was I supposed to indentify all the numbers that would be categorized in the 20th percentile?

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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I had to find the 20th percentile with the following data.    0, 1, 2, 2, 2, 3, 4, 4, 4, 8..... My first answer was 1.8. I got that by doing .20(10) = 1.8. This answer was wrong. I rounded up to 2 and that was also wrong. Was I supposed to indentify all the numbers that would be categorized in the 20th percentile? 

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