huda wrote:
There is an 80% chance David will eat a healthy breakfast and a 25% chance that it will rain. If these events are independent, what is the probability that David will eat a healthy breakfast OR that it will rain?
(A) 20%
(B) 80%
(C) 85%
(D) 95%
(E) 105%
I have a little bit confusion here, before shed some light on my confusion i want to say that,i watched your video related this topic (mutually exclusive, dependent and independent events).
We use this formula when Both Events are mutually exclusive ---First One: P(A or B) = P(A) + P(B), and
When they are not mutually exclusive ----- Second One: P(A or B) = P(A) + P(B) - P(A and B)
NOw above question both event are there mutually exclusive so as rules we need to follow the 1st one but why we used the 2nd one?