Elementary Statistics (12th Edition)

Published by Pearson
ISBN 10: 0321836960
ISBN 13: 978-0-32183-696-0

Chapter 3 - Statistics for Describing, Exploring, and Comparing Data - 3-2 Measures of Center - Basic Skills and Concepts: 30

Answer

The mean is a bit more than 44.1 but sill quite close.

Work Step by Step

The mean can be counted by summing all the data and dividing it by the number of data. Also, at each age group we take the midrange of the group to calculate. The midranges: 20-29:24.5, 30-39:34.5, 40-49:44.5, 50-59:54.5, 60-69:64.5, 70-79:74.5. The mean: $\frac{24.5\cdot1+34.5\cdot26+44.5\cdot35+54.5\cdot13+64.5\cdot6+74.5\cdot1}{82}=44.5$. The mean is a bit more than 44.1 but sill quite close.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.