Mathematics for IGCSE & O level - Probability (Section 6 - No. 43)

Which of the following statements are true regarding probabilities?

Probabilities can be expressed as fractions or decimals.

Probabilities always range from 0 to 1.

The sum of the probabilities of all possible outcomes of an event must equal 1.

A probability of 1 means the event has a 50% chance of occurring.

Probabilities are expressed as values between 0 and 1, inclusive. A probability of 1 indicates certainty.