Question

You are expecting a call from a friend anytime between 3:00 P.M. and 5:00 P.M. At 3:20 P.M, you discover that someone accidentally left the phone off the hook. What is the probability that you missed your friend’s call?

Answer 1

Its sort of higher than most would expect,although still low.my estimation is 40%

Answer 2

The working out:
Difference between 3:00 and 5:00 = 120 mins or 2 hours.
There is a possibility of 20/120 that you missed your friends call.
Hope this helped. If you need more explaining, let me know in the comments.