Basic Probability

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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).

Tags

CCSS.7.SP.C.5

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.

Tags

CCSS.7.SP.C.5

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.

Tags

CCSS.7.SP.C.5

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What is the probability of an event that is 'likely'?

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An event that is 'likely' has a probability greater than 0.5 but less than 1.

Tags

CCSS.7.SP.C.5

Front

What is the probability of an event that is 'unlikely'?

Back

An event that is 'unlikely' has a probability less than 0.5 but greater than 0.

Tags

CCSS.7.SP.C.5

Front

How do you calculate the probability of an event?

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

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CCSS.7.SP.C.7A

Front

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

Back

1/2

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CCSS.7.SP.C.7A

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

Back

3/5

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CCSS.7.SP.C.7B

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What is the probability of rolling a number greater than 4 on a standard die?

Back

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

Tags

CCSS.7.SP.C.7B

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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).

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CCSS.7.SP.C.7B