What describes how likely it is that an event will occur?

What describes how likely it is that an event will occur?

• A. Probability
• B. Outcome
• C. Complement of an event
• D. Sample Space

Answer: (A)

Probability is the measure of how likely it is that something will happen. It’s a number between 0 and 1 (often shown as a fraction, decimal, or percent) that tells you the chance the event occurs. For equally likely outcomes, you find it by counting how many outcomes would make the event happen and dividing by the total number of possible outcomes. For example, in a fair coin flip, there is one favorable outcome (heads) and two possible outcomes (heads or tails), so the probability is 1/2, which is 0.5 or 50%. The remaining ideas describe different things: the outcome is a single result of one trial; the complement is the chance the event does not occur; the sample space is the set of all possible outcomes.

Probability is the measure of how likely it is that something will happen. It’s a number between 0 and 1 (often shown as a fraction, decimal, or percent) that tells you the chance the event occurs. For equally likely outcomes, you find it by counting how many outcomes would make the event happen and dividing by the total number of possible outcomes. For example, in a fair coin flip, there is one favorable outcome (heads) and two possible outcomes (heads or tails), so the probability is 1/2, which is 0.5 or 50%. The remaining ideas describe different things: the outcome is a single result of one trial; the complement is the chance the event does not occur; the sample space is the set of all possible outcomes.