Probability

Front

What is probability?

Back

Probability is a measure of the likelihood that an event will 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 does it mean if an event is 'likely'?

Back

An event is 'likely' if it has a high probability of occurring, typically greater than 0.5.

Front

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

Back

An event is 'unlikely' if it has a low probability of occurring, typically less than 0.5.

Front

How do you calculate the probability of an event?

Back

The probability of an event is calculated by dividing the number of favorable outcomes by the total number of possible outcomes.

Front

If a spinner has 4 equal sections (red, blue, green, yellow), what is the probability of landing on red?

Back

The probability of landing on red is 1/4 or 0.25.

Front

In a bag with 12 red marbles and 0 other colors, what is the probability of drawing a red marble?

Back

The probability of drawing a red marble is 1 (certain) since all marbles are red.

Front

If a box contains 12 white marbles, what is the probability of selecting a red marble?

Back

The probability of selecting a red marble is 0 (impossible) since there are no red marbles.

Front

What is the probability of pulling out a red marble from a bag containing 12 yellow, 3 blue, and 1 red marble?

Back

The probability of pulling out a red marble is 1/16 or 0.0625, which is unlikely.