Answer
10.5 picocuries per liter is the mean.
Work Step by Step
$ 6.2 + 12.8 + 7.6 + 15.4 = 42 $
$ 42/4 = 10.5 $
The Basic Practice of Statistics 7th Edition
by Moore, David S.; Notz, William I.; Fligner, Michael A.
Published by
W. H. Freeman
ISBN 10:
146414253X
ISBN 13:
978-1-46414-253-6
Chapter 2 - Describing Distributions with Numbers - Apply Your Knowledge - Page 60: 2.10a
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