Probability Language

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 does 'unlikely' mean in terms of probability?

Back

An unlikely event has a probability greater than 0 but less than 0.5, meaning it is not expected to happen.

Front

What does 'as likely as not' mean?

Back

An event that is 'as likely as not' has a probability of 0.5, meaning it has an equal chance of occurring or not occurring.

Front

How do you calculate the probability of an event?

Back

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

Front

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

Back

P(red) = 3/(3+2) = 3/5.

Front

What is the probability of rolling a number greater than 4 on a fair six-sided die?

Back

P(greater than 4) = 2/6 = 1/3.

Front

What is the probability of landing on a red space on a spinner divided into 4 equal parts: 2 red and 2 blue?

Back

P(red) = 2/4 = 1/2.

Front

If two bags have the same number of red and blue marbles, what can we say about their probabilities of selecting a red marble?

Back

They have equal probability of selecting a red marble.