Concept explainers
a.
To explain: The reason of mean of Y locating at the solid red line.
a.
Explanation of Solution
Given:
The figure is:
The provided figure shows that the distribution is symmetric because the mean is the at the center at 5 which implies that the distribution is approximately
b.
To find: The expected value of the first digit.
b.
Answer to Problem 13E
The expected value is 3.441.
Explanation of Solution
The expected value of the first digit can be computed as:
This indicates that the mean of the first digit is 3.441.
c.
To find: The
c.
Answer to Problem 13E
Expense report is incorrect.
Explanation of Solution
The probability using Benford’s law can be computed as:
Since, the proportion is closer to 0.155. It could be concluded that the report of the expense is incorrect.
Chapter 6 Solutions
The Practice of Statistics for AP - 4th Edition
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An Introduction to Mathematical Statistics and Its Applications (6th Edition)
Introductory Statistics
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Elementary Statistics
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