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The United States has an aging infrastructure as witnessed
Chapter 6, Problem 20E(choose chapter or problem)
Problem 20E
The United States has an aging infrastructure as witnessed by several recent disasters, including the I-35 bridge failure in Minnesota. Most states inspect their bridges regularly and report their condition (on a scale from 1–17) to the public. Here are the condition numbers from a sample of 30 bridges in New York State (https://www.dot.ny.gov/main/bridgedata): 5.08 5.44 6.66 5.07 6.80 5.43 4.83 4.00 4.41 4.38 7.00 5.72 4.53 6.43 3.97 4.19 6.26 6.72 5.26 5.48 4.95 6.33 4.93 5.61 4.66 7.00 5.57 3.42 5.18 4.54
(a) Find the sample mean and sample standard deviation of these condition numbers.
(b) Construct a dot diagram of the data.
Questions & Answers
QUESTION:
Problem 20E
The United States has an aging infrastructure as witnessed by several recent disasters, including the I-35 bridge failure in Minnesota. Most states inspect their bridges regularly and report their condition (on a scale from 1–17) to the public. Here are the condition numbers from a sample of 30 bridges in New York State (https://www.dot.ny.gov/main/bridgedata): 5.08 5.44 6.66 5.07 6.80 5.43 4.83 4.00 4.41 4.38 7.00 5.72 4.53 6.43 3.97 4.19 6.26 6.72 5.26 5.48 4.95 6.33 4.93 5.61 4.66 7.00 5.57 3.42 5.18 4.54
(a) Find the sample mean and sample standard deviation of these condition numbers.
(b) Construct a dot diagram of the data.
ANSWER:
Solution:
Step 1 of 3:
The data regarding the condition numbers of the 30 bridges in New York State is given.
5.08,5.44,6.66,5.07,6.80,5.43,4.83,4.00,4.41,4.38,7.00,5.72,4.53,6.43,3.97,4.19,6.26,6.27,5.36,5.48,4.95,6.33,4.93,5.61,4.66,7.00,5.57,3.40,5.18,5.54.
Using this data we need to find the required values.