Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 11 Data Analysis and Statistics - 11.2 Apply Transformations to Data - 11.2 Exercises - Problem Solving - Page 754: 20

Answer

Answer B

Work Step by Step

The mean of the scores is 68, and the standard deviation is 15. The teacher decides to scale the test scores by adding 10 points to each score; thus the mean becomes $C=68+10=78$. The standard deviation is still $15$ Hence, the correct answer is B.
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