Answer
$s=0$
The data values have no dispersion.
Work Step by Step
The mean:
$x̅=\frac{78+78+78+78}{4}=78$
The standard deviation:
$s=\sqrt {\frac{Σ(x_i-x̅)^2}{n-1}}=\sqrt {\frac{(78-78)^2+(78-78)^2+(78-78)^2+(78-78)^2}{4-1}}=\frac{0}{3}=0$
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 - Assess Your Understanding - Applying the Concepts - Page 155: 40
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