Events and their associated probabilities are included in the table above. Which event(s) has(have) a valid probability?
A
A, B, F
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B
B, C, E
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C
B, D, E, F
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D
A, C
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Solution
The correct option is C B, D, E, F
Event (E)
Value for P (E)
A
−0.00001
B
0.5
C
1.001
D
0
E
1
F
20%
We know, 0≤P (E)≤1,
or 0%≤P (E)≤100%
From the table, it is clear that the probabilities of B, D, E and F lie between either 0and1 or 0%and100%. Hence, events B, D, E, and F have valid probabilities.
As P(A)=−0.00001<0 and P(C)=1.001>1, the events A and C have invalid probabilities.