# A credit card contains 16 digits. It also contains a month and year of expiration. Suppose there

## Question:

(a) What is the probability that it belongs to a user?

(b) Suppose a hacker has a 25% chance of correctly guessing the year your card expires and randomly selects one of the 12months. What is the probability that the hacker correctly selects the month and year of expiration?

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**Related Book For**

## Applied Statistics And Probability For Engineers

**ISBN:** 9781118539712

6th Edition

**Authors:** Douglas C. Montgomery, George C. Runger