Simple Probability

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What is the definition of probability?

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Probability is a measure of the likelihood that an event will occur, expressed as a number between 0 and 1, where 0 indicates impossibility and 1 indicates certainty.

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CCSS.7.SP.C.5

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How is probability calculated?

Back

Probability is calculated using the formula: P(E) = Number of favorable outcomes / Total number of possible outcomes.

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CCSS.7.SP.C.7A

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What does a probability of 0% mean?

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A probability of 0% means that the event is impossible and will not occur.

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CCSS.7.SP.C.5

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What does a probability of 100% mean?

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A probability of 100% means that the event is certain to occur.

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CCSS.7.SP.C.5

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What is the probability of an event that has 3 favorable outcomes out of 5 possible outcomes?

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The probability is 3/5 or 60%.

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CCSS.7.SP.C.7B

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If an event has a probability of 1/5, what percentage does this represent?

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This represents a probability of 20%.

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CCSS.7.SP.C.5

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What is the probability of an event with 1 favorable outcome out of 3 possible outcomes?

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The probability is 1/3 or approximately 33.3%.

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CCSS.7.SP.C.7A

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How do you convert a fraction to a percentage in probability?

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To convert a fraction to a percentage, divide the numerator by the denominator and then multiply by 100.

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What is the probability of an event that has 5 favorable outcomes out of 6 possible outcomes?

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The probability is 5/6 or approximately 83.3%.

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CCSS.7.SP.C.7B

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What is the complement of an event in probability?

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The complement of an event is the probability that the event does not occur, calculated as 1 - P(E).

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CCSS.HSS.CP.A.1