Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 12 - Data Analysis and Probability - 12-5 Samples and Surveys - Mixed Review - Page 747: 45


The percentile rank is 40.

Work Step by Step

You have to find out what percent of test scores were less than or equal to 85. They were 12 scores that were less than or equal to 85. They were 30 test scores. So using this information we write a ratio, 12:30.We divide to get a percent: $\frac{12}{30}$=0.4.To change into a percent you move the decimal 2 times to the right to get 40%. So the percentile rank of a test score of 85 or less is 40
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