If P(A)=0.4 and P(B)=0.3 and events are mutually exclusive what is P(A or B)?
A
0.12
B
0.58
C
0.70
D
0.82
Correct Answer: Option C — 0.70
Explanation:
For mutually exclusive events P(A or B) = P(A)+P(B) = 0.4+0.3 = 0.7. Mutually exclusive events cannot occur simultaneously. The addition rule for mutually exclusive events simply adds probabilities. For non-mutually exclusive events we must subtract P(A and B) to avoid double counting.