Probability

Front

What is probability?

Back

Probability is a measure of how likely an event is to occur, expressed as a number between 0 (impossible) and 1 (certain).

Front

What does it mean if an event is 'certain'?

Back

An event is 'certain' if it is guaranteed to happen, with a probability of 1.

Front

What does it mean if an event is 'impossible'?

Back

An event is 'impossible' if it cannot happen at all, with a probability of 0.

Front

What is the probability of an event that is 'likely'?

Back

An event that is 'likely' has a probability greater than 0.5 but less than 1.

Front

What is the probability of an event that is 'unlikely'?

Back

An event that is 'unlikely' has a probability less than 0.5 but greater than 0.

Front

How do you calculate the probability of a single event?

Back

Probability of a single event = (Number of favorable outcomes) / (Total number of possible outcomes).

Front

If a spinner has 8 equal sections numbered 1 to 8, what is the probability of landing on a number less than 6?

Back

Probability = 5/8, since there are 5 favorable outcomes (1, 2, 3, 4, 5) out of 8 total outcomes.

Front

What is the probability of choosing a purple bow from a box with 5 pink, 1 blue, and 4 purple bows?

Back

Probability = 4/10 = 2/5.

Front

What is the combined probability of rolling a 3 on a die and spinning a red on a spinner with 4 colors?

Back

Probability = (1/6) * (1/4) = 1/24.

Front

How do you find the probability of an event NOT happening?

Back

Probability of NOT A = 1 - Probability of A.