A two-day conference is going to be held in a city. The leading newspaper in the city says there is a 10% chance of rain on the first day of the conference and a 40% chance of rain on the second day.
If the newspaper’s figures are correct, the chance that it rains in the city during the conference is:

at least 0%, but we can’t get a better lower bound with the information given.
at least 10% but it might be less than 40%.
at least 40%.

Question

A two-day conference is going to be held in a city. The leading newspaper in the city says there is a 10% chance of rain on the first day of the conference and a 40% chance of rain on the second day.
If the newspaper’s figures are correct, the chance that it rains in the city during the conference is:


at least 0%, but we can’t get a better lower bound with the information given.
at least 10% but it might be less than 40%.
at least 40%.

anonymous · Answer

Hi, 
6a)
at least 40%
it's right answer

anonymous · Answer

Also 6b)
at most 50%.

(waiting for "Best responce ;-) "

anonymous · Answer

please explain more.
thank you