7th Grade 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?

Back

The probability of a certain event is 1.

Front

What is the probability of an event that is impossible?

Back

The probability of an impossible event is 0.

Front

If a bag contains 3 red marbles, 2 blue marbles, and 4 yellow marbles, what is the total number of marbles?

Back

The total number of marbles is 9.

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 pulling a red marble from a bag with 3 red, 2 blue, and 4 yellow marbles?

Back

The probability is 3/9 or 1/3.

Front

What does 'equally likely' mean in probability?

Back

'Equally likely' means that all outcomes have the same chance of occurring.

Front

What is a tree diagram?

Back

A tree diagram is a visual representation of all possible outcomes of an event.

Front

How many outcomes are there when rolling a die and flipping a coin?

Back

There are 12 outcomes (6 outcomes from the die x 2 outcomes from the coin).

Front

What is the probability of spinning a spinner and landing on a number?

Back

The probability is 1, as landing on a number is certain.