Elementary Statistics: A Step-by-Step Approach with Formula Card 9th Edition

Published by McGraw-Hill Education
ISBN 10: 0078136334
ISBN 13: 978-0-07813-633-7

Chapter 2 - Frequency Distributions and Graphs - 2-1 Organizing Data - Exercise 2-1 - Page 51: 7


boundary is 8.235-11.365 midpoint is 9.80 width is 3.12

Work Step by Step

Since the class has 2 decimal places, the boundary will have 3 decimal place. Subtract 0.005 from smallest value and add 0.005 to the largest value to find the boundary. $8.24-0.005=8.235$ $11.36+0.005=11.365$ To find the midpoint, add the upper and lower values and divide by 2. $\frac{8.24+11.36}{2}=\frac{19.60}{2}=9.80$ To find the width, subtract the lower value from the upper value. $11.36-8.24=3.12$
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