Unformatted text preview: using correct symbols: b) Compare the mean and the standard deviation and comment on your findings. • The mean percentage of functionally obsolete bridges in the US seems to be more than the mean percentage of structurally deficient bridges. • However, both seem to have the same dispersion around their respective means. • Using the empirical rule, we may state that about 95% of all states have between 2.4% and 19.1% structurally deficient bridges. • Also, by empirical rule we can state that about 95% of the states have between 6.9% ans 23.1% functionally obsolete bridges....
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 Fall '08
 Kyung
 Statistics, Standard Deviation, Mean, Structurally Deficient Bridges, functionally obsolete bridges

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