A and B are mutually exclusive events. PA) = 0.50 and P(B) = 0.30. What is
PA or B)?

P(A∪B)=0.8

Explanation:

Given that,

A and B are mutually exclusive events such that,

P(A)=0.5 and P(B)=0.3

We need to find P(A or B). It means we need to find P(A∪B). If two events are mutually exclusive, P(A∩B)=0. So,

P(A∪B)=P(A)+P(B)-P(A∩B)

Putting P(A) and P(B), we get :

P(A∪B)=0.5+0.3-0

P(A∪B)=0.8

So, the value of P(A or B) is 0.8

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

the higher the current the higher the mag field around it the higher the influence on the compass