The United States has an aging infrastructure as witnessed by several recent dis

Question

The United States has an aging infrastructure as witnessed by several recent disasters, including the 1-35 bridge failure in Minnesota. Most states inspect their bridges regularly and report their condition (on a scale from 1-170 to the public. Here are the condition numbers from a sample of 30 bridges in New York State Find the sample mean and sample standard deviation of these condition numbers. Construct a stem-and-leaf diagram. Use a leaf unit of 0.1 (and ignore the hundredths). Find the quartiles and median of the data. Draw a box plot for the data. Should any points be considered potential outliers?

Explanation / Answer

STEAM LEAF 5.08 6.43 4.38 Average= 5.328333 3 4 9 5.44 3.97 7 Standard Deviation 0.975338 4 0 1 3 4 5 5 6 8 9 9 6.66 4.19 5.72 Median 5.22 5 0 0 1 2 4 4 4 5 6 7 5.07 6.26 4.53 1st Quartile 4.5375 6 2 3 4 6 7 8 6.8 6.72 4.93 2nd Quartile 5.26 7 0 0 5.43 5.26 5.61 3rd Quartile 6.125 4.83 5.48 4.66 4 4.95 7 4.41 6.33 5.57 3.42 5.18 4.54

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