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 and 1.

Tags

CCSS.7.SP.C.5

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What does P(A) represent?

Back

P(A) represents the probability of event A occurring.

Tags

CCSS.7.SP.C.5

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What is the formula for calculating the probability of an event?

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The formula is P(A) = Number of favorable outcomes / Total number of outcomes.

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CCSS.7.SP.C.7A

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What is the probability of an event that cannot happen?

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The probability is 0.

Tags

CCSS.7.SP.C.5

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What is the probability of an event that is certain to happen?

Back

The probability is 1.

Tags

CCSS.7.SP.C.5

Front

How do you calculate P(not A)?

Back

P(not A) = 1 - P(A).

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CCSS.HSS.CP.A.2

CCSS.HSS.CP.A.4

Front

If a spinner has 8 equal sections, what is the probability of landing on one specific section?

Back

The probability is 1/8.

Tags

CCSS.7.SP.C.7A

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How do you convert a decimal to a percent?

Back

Multiply the decimal by 100 and add a percent sign.

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What is the probability of choosing a letter from the word 'ALGEBRA' that is not 'A'?

Back

There are 5 letters that are not 'A' out of 7 total letters, so the probability is 5/7.

Tags

CCSS.7.SP.C.7B

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In a bag with 3 red, 2 blue, and 5 green marbles, what is the probability of picking a blue marble?

Back

The probability is 2/10 or 1/5.

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CCSS.7.SP.C.7B