Simple 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 a probability of 0.5 mean?

Back

A probability of 0.5 means that the event is 'as likely as not' to happen.

Front

How many outcomes are there when rolling a single die?

Back

There are 6 possible outcomes when rolling a single die: 1, 2, 3, 4, 5, or 6.

Front

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

Back

The probability is 5/6, since the outcomes 2, 3, 4, 5, and 6 are greater than 1.

Front

What is the probability of spinning an even number on a spinner divided into 4 equal sections numbered 1 to 4?

Back

The probability is 2/4 or 50%, since the even numbers are 2 and 4.

Front

If a deck of cards has 52 cards, what is the probability of drawing an 8 of diamonds?

Back

The probability is 1/52, since there is only one 8 of diamonds in a standard deck.

Front

What is the probability of choosing a letter that is NOT 'A' from the word 'ALGEBRA'?

Back

The probability is 5/7, since there are 5 letters that are not 'A' out of 7 total letters.

Front

What is the formula for calculating probability?

Back

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

Front

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

Back

An event is 'certain' if it has a probability of 1, meaning it will definitely happen.

Front

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

Back

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