Events A and B are mutually exclusive.
Also, P(A) = 0.15 and P(B) = 0.2. Medal

What is P(A or B)?

A.
0.05

B.
0.03

C.
0.20

D.
0.35

Question

Events A and B are mutually exclusive.
Also, P(A) = 0.15 and P(B) = 0.2.   Medal
 
What is P(A or B)?
 
 A.
0.05
 
 B.
0.03
 
 C.
0.20
 
 D.
0.35

anonymous · Answer

@Phebe

anonymous · Answer

@JoannaBlackwelder

anonymous · Answer

For mutually exclusive events, their intersection or AND is 0.. ie:
$$P(A \; and \; B) = 0$$

anonymous · Answer

So as you know:
$$P(A \; or \; B) = P(A) + P(B) - P(A \; and \; B)$$

anonymous · Answer

As last term is 0 for Mutually Exclusive events, as nothing is common in them..
So, you left with only first two terms here..

anonymous · Answer

http://openstudy.com/study#/updates/5564a093e4b0423951d68ce9

anonymous · Answer

$$P(A \; or \; B) = P(A) + P(B)$$

You have now all the things, just use it to find answer...

anonymous · Answer

0.35 @eta

anonymous · Answer

Absolutely...

anonymous · Answer

$\dagger$