Probability

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What is probability?

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Probability is a measure of how likely an event is to happen. It is expressed as a number between 0 (impossible) and 1 (certain).

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What does 'certain' mean in probability?

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'Certain' means that an event will definitely happen. For example, the sun will rise tomorrow is a certain event.

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What does 'impossible' mean in probability?

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'Impossible' means that an event cannot happen at all. For example, rolling a 7 on a standard 6-sided die is impossible.

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What does 'likely' mean in probability?

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'Likely' means that an event has a good chance of happening, but it is not guaranteed.

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What does 'unlikely' mean in probability?

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'Unlikely' means that an event has a small chance of happening.

Front

If you have a bag with 3 red marbles and 2 blue marbles, what is the probability of pulling a red marble?

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The probability of pulling a red marble is unlikely.

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If a bag has 4 yellow marbles and no red marbles, what is the probability of pulling a red marble?

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The probability of pulling a red marble is impossible.

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What is the probability of drawing a star from a set of shapes that has no stars?

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The probability of drawing a star is impossible.

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If you have a bag with 3 red marbles, 2 blue marbles, and 4 yellow marbles, what is the probability of pulling a blue marble?

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The probability of pulling a blue marble is unlikely.

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What does 'equally likely' mean in probability?

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