Introduction to Probability

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

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

• It means there is a 50% chance that the event will occur.

• It means there is a 75% chance that the event will occur.

• It means there is a 10% chance that the event will occur.

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What is the probability of rolling a 3 on a single die?

• 1/2

• 1/4

• 1/6

• 1/3

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CCSS.7.SP.C.7A

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

• An unlikely event has a probability less than 1/2 but greater than 0.

• An unlikely event has a probability of exactly 0.

• An unlikely event has a probability greater than 1/2.

• An unlikely event is certain to happen.

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

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

• 1/6, because there are six sides on a die.

• 1/12, because there are twelve possible outcomes.

• 1, because you can always roll a number on a die.

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

• An impossible event has a probability of 1, meaning it is certain to happen.

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

• An impossible event has a probability of 0.5, meaning it is equally likely to happen or not happen.

• An impossible event has a probability of 0.25, meaning it is unlikely to happen.

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

• 1/4

• 1/3

• 1/2

• 2/3

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CCSS.7.SP.C.7A

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

• 1/6

• 2/6

• 3/6

• 5/6

What is the total number of outcomes when rolling a single die?

• 4

• 5

• 6

• 7

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

• 1/4

• 1/3

• 1/2

• 2/3

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CCSS.7.SP.C.7A

What is a fair coin?

• A coin that is biased towards heads.

• A coin that has an equal chance of landing on heads or tails.

• A coin that is made of gold.

• A coin that can only land on tails.

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