Posted by Sally on Saturday, February 7, 2009 at 7:55pm.
.27 percent
http://www.math.csusb.edu/faculty/stanton/m262/normal_distribution/normal_distribution.html
The mean length of the first 20 space shuttle flights was about 7 days, and
the standard deviation was about 2 days. On the basis of Chebychev’s
Theorem, at least how many of the flights lasted between 3 days and 11
days?
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