Basic 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 is the probability of an event that is certain to happen?

Back

1

Front

What is the probability of an event that is impossible?

Back

0

Front

If a bag contains 3 red marbles and 2 green marbles, what is the probability of picking a red marble?

Back

3/5

Front

What does a probability of 0.5 mean?

Back

It means there is an equal chance of the event occurring or not occurring.

Front

How do you calculate the probability of an event?

Back

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

Front

What is the probability of flipping a coin and getting tails?

Back

0.5 or 1/2.

Front

If a die is rolled, what is the probability of rolling a number greater than 4?

Back

1/3 (only 5 and 6 are greater than 4).

Front

What is a sample space in probability?

Back

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

Front

What is the probability of drawing a heart from a standard deck of cards?

Back

1/4 (there are 13 hearts in a deck of 52 cards).