Probability 4.13

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, 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 blue marble in a bag of ten marbles, it is unlikely that you will pick the blue one.

Front

If you have a bag with 3 red marbles and 2 blue marbles, what is the probability of picking a red marble?

Back

The probability of picking a red marble is 3/5.

Front

If you roll a die, what is the probability of landing on an even number?

Back

The probability of landing on an even number (2, 4, or 6) is 3/6 or 1/2.

Front

What is the probability of picking a black marble if there are no black marbles in the bag?

Back

The probability is 0, which means it is impossible to pick a black marble.

Front

If you have a spinner divided into 4 equal parts: red, blue, green, and yellow, what is the probability of landing on red?

Back

The probability of landing on red is 1/4.

Front

What is the total number of outcomes when rolling a die?

Back

The total number of outcomes when rolling a die is 6.