Answer
$s=0.152~grams$
Work Step by Step
$s=\sqrt {\frac{Σ(x_i−x̅)2}{n-1}}=\sqrt {\frac{(86.8-87.05)^2+(87.0-87.05)^2+(87.0-87.05)^2+(87.1-87.05)^2+(87.2-87.05)^2+(87.2-87.05)^2}{6-1}}=0.152$
Statistics: Informed Decisions Using Data (4th Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0321757270
ISBN 13:
978-0-32175-727-2
Chapter 3 - Section 3.2 - Consumer Reports - Basement Waterproofing Coatings - Page 157: d
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