Probability Basics

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 is the probability of an event that is certain?

Back

The probability of an event that is certain is 1.

Front

What is the probability of an event that is impossible?

Back

The probability of an event that is impossible is 0.

Front

How do you calculate the probability of an event?

Back

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

Front

If a spinner has 8 equal sections and 2 are labeled A, what is the probability of landing on A?

Back

The probability of landing on A is 2/8 or 1/4.

Front

In a bag with 30 candies (15 grape, 7 cherry, 3 lemon, 5 strawberry), what is the probability of picking a lemon?

Back

The probability of picking a lemon is 3/30 or 1/10.

Front

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

Back

An event is 'unlikely' if it has a probability less than 0.5.

Front

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

Back

An event is 'probable' if it has a probability greater than 0.5.

Front

What is a sample space in probability?

Back

A sample space is the set of all possible outcomes of a probability experiment.

Front

What is a favorable outcome?

Back

A favorable outcome is an outcome that satisfies the condition of the event we are interested in.