Introduction to 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 does it mean if an event is 'impossible'?

Back

An impossible event has a probability of 0, meaning it cannot happen.

Front

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

Back

A certain event has a probability of 1, meaning it will definitely happen.

Front

What is the probability of flipping a fair coin and getting heads?

Back

1/2

Front

What is the probability of rolling a single die and getting a number greater than 1?

Back

5/6

Front

What is the probability of rolling a single die and getting a 7?

Back

0, because a standard die only has numbers 1 through 6.

Front

What does 'as likely as not' mean in probability?

Back

It means the probability of an event is 1/2, indicating it is equally likely to happen or not happen.

Front

If the probability of an event is 1/4, what does that mean?

Back

It means there is a 25% chance that the event will occur.

Front

What is the probability of not rolling a 2 on a single die?

Back

5/6

Front

How do you calculate the probability of an event?

Back

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