Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 12 - Data Analysis and Probability - 12-7 Theoretical and Experimental Probability - Practice and Problem-Solving Exercises - Page 774: 39



Work Step by Step

P(event)=$\frac{numberoffavorableoutcomes}{numberofpossibleoutcomes}$ There are 20 differences from the stem and leaf plot so this is the number of possible outcomes. Out of the 20, eight are less than 10 points:1, 3, 3, 3, 3,4, 7, 7 so this is the number of favorable outcomes. So, the probability is: P(less than 10 points)=$\frac{8}{20}$ -simplify- P(less than 10 points)=$\frac{2}{5}$
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