The Basic Practice of Statistics 7th Edition

Published by W. H. Freeman
ISBN 10: 1-46414-253-X
ISBN 13: 978-1-46414-253-6

Chapter 2 - Describing Distributions with Numbers - Chapter 2 Exercises - Page 68: 2.32d

Answer

Q1 is located in the group of 461,553 babies (20-24 years old). The median is located in the group of 421,704 babies (25-29 years old). Q3 is located in the group of 299,857 babies (30-34 years old).

Work Step by Step

A total of 1,570,759 babies were born. The median would be in the middle of that number, data point #785,380. This data point is in the group of babies born to parents 25-29 years old. $\frac{1570759}{2} = 785379.5$ $\frac{785379}{2} = 392689.5 $ (distance to quarter) Q1 would be found in the group of babies born to parents aged 20-24. (Data point 392,690) Q3 would be found in the group of babies born to parents aged 30-34. (Data point 1,178,069)
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