Answer
$75$%$,150,410$
Work Step by Step
Using Chebyshev's theorem, 75% of the values are maximum 2 standard deviations from the mean. Minimum:$280-2\cdot65=150$, maximum:$280+2\cdot65=410$.
Essentials of Statistics (5th Edition)
by Triola, Mario F.
Published by
Pearson
ISBN 10:
0-32192-459-2
ISBN 13:
978-0-32192-459-9
Chapter 3 - Statistics for Describing, Exploring, and Comparing Data - 3-3 Measures of Variation - Page 111: 43
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