What is the probability that a month chosen at random has less than 31 days?

[math_celebrity]

What is the probability that a month chosen at random has less than 31 days?

Months with 31 days:

1. January
2. March
3. May
4. July
5. August
6. October
7. December

7 months out of 12 have 31 days, so our probability is 7/12