A fair die is thrown. If E is the event that 'the number appearing is a multiple of 3' and F be the event that the number appearing is even'. Then choose the correct option given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option 4: E and F are independent events.
A fair die has sample space: S = {1, 2, 3, 4, 5, 6}
Step 1: Define events
E = multiples of 3
E = {3, 6}
F = even numbers
F = {2, 4, 6}
Step 2: Find probabilities
P(E) = 2/6 = 1/3
P(F) = 3/6 = 1/2
So the statement P(F) = 1/3 is false.
Step 3: Find
E ∪ F = {2, 3, 4, 6}
P(E ∪ F) = 4/6 = 2/3
So P(E ∪ F) = 1/2 is false.
Step 4: Check if events are mutually disjoint
E ∩ F = {6}
Since the intersection is not empty, they are not mutually disjoint.
Step 5: Check independence
P(E ∩ F) = 1/6
P(E)P(F) = (1/3)(1/2) = 1/6
Since
P(E ∩ F) = P(E)P(F)
E and F are independent events.