Answer
At a minimum, 84% of the bulbs will have a lifetime within 2.5 S.D. of the mean.
Work Step by Step
Here, k = 2.5.
Using Chebyshev's Inequality:
$(1 - 1/2.5^{2})100\% = 84\%$
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 - Review - Review Exercises - Page 184: 5e
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