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The Practice of Statistics | 5th Edition | ISBN: 9781464108730 | Authors: Daren S. Starnes, Josh Tabor
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Benfords law Refer to Exercise 5. The first digit of a randomly chosen expense account

Chapter 6, Problem 7

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QUESTION:

Benfords law Refer to Exercise 5. The first digit of a randomly chosen expense account claim follows Benfords law. Consider the events A = first digit is 7 or greater and B = first digit is odd. (a) What outcomes make up the event A? What is P(A)? (b) What outcomes make up the event B? What is P(B)? (c) What outcomes make up the event A or B? What is P(A or B)? Why is this probability not equal to P(A) + P(B)?

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QUESTION:

Benfords law Refer to Exercise 5. The first digit of a randomly chosen expense account claim follows Benfords law. Consider the events A = first digit is 7 or greater and B = first digit is odd. (a) What outcomes make up the event A? What is P(A)? (b) What outcomes make up the event B? What is P(B)? (c) What outcomes make up the event A or B? What is P(A or B)? Why is this probability not equal to P(A) + P(B)?

ANSWER:

Step 1 of 5

Given,

The event first digit is 7 or greater = A

The event first digit is odd = B.

Using the probability distribution in Exercise 5 we can determine the following:

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