Which of the following cannot be the probability of an event?
(A) \(\dfrac{2}{3}\) (B) −1.5 (C) 15% (D) 0.7
(B) −1.5
Probabilities must lie between 0 and 1 (inclusive). The number −1.5 is negative, so it cannot be a probability. The others (\(\dfrac{2}{3}\), 15% = 0.15, and 0.7) all lie between 0 and 1.