The probability of randomly meeting someone with a phone number that ends in three is 1 in 10 or 0.1, assuming a uniform distribution of phone numbers.
The probability of randomly meeting someone with a phone number that ends in three depends on the distribution of phone numbers and the assumption that each possible phone number ending is equally likely. In many countries, phone numbers are assigned randomly, and the last digit can be any number from 0 to 9.
If we consider a standard distribution of phone numbers where each digit has an equal chance of appearing, the probability of a phone number ending in three is 1 in 10. This is because there are ten possible digits (0 to 9), and only one of them is three. Therefore, the probability can be expressed as 1/10 or 0.1.
It's important to note that this probability assumes a uniform distribution of phone numbers, and the actual probability may vary depending on factors such as local numbering plans and assignment practices. Additionally, in some countries, phone numbers may be structured in a way that makes certain digits more or less likely to appear in the last position.