Question

Which of these numbers can not be a probability?


0.5


-0.000001


0


1

Answer 1

In probability theory, a probability must always be between 0 and 1, inclusive. This means:

- It can be 0 (indicating an impossible event).
- It can be 1 (indicating a certain event).
- It can be any number in between (e.g., 0.5).

Now, let's evaluate the given numbers:

- 0.5: This is a valid probability.
- -0.000001: This is not a valid probability since it is negative.
- 0: This is a valid probability (indicating an impossible event).
- 1: This is a valid probability (indicating a certain event).

Therefore, the number that **cannot** be a probability is **-0.000001**.