Question:
Which of the following cannot be the probability of an event?
(A) $\frac{2}{3}$
(B) $-1.5$
(C) $15 \%$
(D) $0.7$
Solution:
Probability of an event (E) is always greater than or equal to 0. Also, it is always less than or equal to one. This implies that the probability of an event cannot be negative or greater than 1. Therefore, out of these alternatives, −1.5 cannot be a probability of an event.
Hence, (B)