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 'certain' mean in probability?

Back

'Certain' means that an event will definitely happen. For example, if you flip a coin, it is certain that it will land as either heads or tails.

Front

What does 'impossible' mean in probability?

Back

'Impossible' means that an event cannot happen at all. For example, rolling a 7 on a standard 6-sided die is impossible.

Front

What does 'probable' mean in probability?

Back

'Probable' means that an event is likely to happen, but it is not guaranteed. For example, if there are more red marbles than blue marbles in a bag, it is probable that you will pick a red marble.

Front

What does 'unlikely' mean in probability?

Back

'Unlikely' means that an event is not likely to happen, but it is still possible. For example, if there is only one green marble in a bag of ten marbles, it is unlikely that you will pick the green marble.

Front

If you have 3 red marbles and 1 black marble, what is the probability of picking a black marble?

Back

The probability is 1 out of 4, or 1/4.

Front

If you have 2 pink marbles, 3 green marbles, and 5 yellow marbles, which color is most likely to be picked?

Back

Yellow is the most likely color to be picked because there are 5 yellow marbles.

Front

What is the probability of rolling a 1 on a 6-sided die?

Back

The probability is 1 out of 6, or 1/6.

Front

What is the probability of rolling an even number on a 6-sided die?

Back

The probability is 3 out of 6, or 1/2, because the even numbers are 2, 4, and 6.

Front

If you have a bag with 4 blue marbles and 2 red marbles, what is the probability of picking a blue marble?

Back

The probability is 4 out of 6, or 2/3.