Question

1. You are dialing a friend’s cell phone number (7 digits), but can’t remember the last digit. If you guess at the final digit, what is the probability that you dialed the number correctly?

Answer 1

You are dialing a friend’s cell phone number (7 digits), but can’t remember the last digit. If you guess at the final digit, what is the probability that you dialed the number correctly?

The first 6 digits of the cell phone number are known and are certain.Only the last digit is guessed.

The possibilities of the last digit are 0,1,2,3,4,5,6,7,8,9 i.e. in total 10 Of which only 1 is correct

Pobability that you dialed the number correctly =

= Favorable events/Total events = 1/10 = 0.1