Properties of Logarithms Answers

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Benford’s law states that the probability that a number in a set has a given leading digit, d, is P(d) = log(d + 1) - log(d).State which property you would use to rewrite the expression as a single logarithm, and rewrite the logarithm. What is the probability that the number 1 is the leading digit? Explain.

Answer:

To rewrite the expression, use the quotient property of logarithms, which states that log(a) - log(b) = log(a/b). The expression becomes P(d) = log((d + 1) / d). To find the probability that 1 is the leading digit, substitute d = 1 into the expression: P(1) = log((1 + 1) / 1) = log(2). Since log(2) is approximately 0.301, the probability that the first digit is 1 is approximately 30.1% or 0.30.

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Which of the following did you include in your solution?

A
Use the quotient property to rewrite the expression.
B
Write the difference of logs as the quotient log((d+1)/d).
C
Substitute 1 for d to get log(2).
D
Since log(2) = 0.30, the probability that the number 1 is the leading digit is about 30%.
3

= ABC✔ D

A
A
B
B
C
C
D
✔ D
4

= A✔ BCD

A
A
B
✔ B
C
C
D
D

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