Answer
People did not live together unless they were married in 1970.
Work Step by Step
If people didn't live together unless they were married in 1970 it would explain why that line is at 0% for the year 1970.
Basic College Mathematics (9th Edition)
by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.
Published by
Pearson
ISBN 10:
0321825535
ISBN 13:
978-0-32182-553-7
Chapter 10 - Statistics - Summary Exercises - Graphs - Page 728: 16
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