Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 1 - Problem Solving and Critical Thinking - 1.2 Estimation, Graphs, and Mathematical Models - Exercise Set 1.2: 45

Answer

a. 85 b. 5325

Work Step by Step

a. The green bar in the graph for the word weird looks to be right in the middle between the dotted lines extending from the points $80$ and $90$; therefore we can estimate that $85$ people per $100$ spell weird correctly. b. For the word inoculate, we can see that the blue graph is a little bit to the left from the center between $20$ and $30$, but covers more than a third of the space; therefore we can say that its value is approximately $24$. If $85$ in $100$ spell weird correctly, and $24$ in $100$ spell inoculate correctly, then in $100$ people, there are: $85 – 24 = 61$ more people who spell weird correctly than there are people who spell inoculate correctly. In a group consisting of $8729$, with that ratio, there's going to be: $8729*\frac{61}{100}\approx5325$ more people who spell weird correctly than there are people who spell inoculate correctly.
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