PROBABILITY - REVISION

Probability is...

• The chance something will happen

• How often an event occurs

• Only something we can theorise about

• Can only be calculated after an experiment

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Experimental Probability is:

• What Will happen 
• What actually happens
• What should happen
• What I think Happens

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Probability can be written as ...

• a fraction
• a decimal
• a percent
• all of the above

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The chart below represents the number of marbles in a jar.
P(green) = 

• 5/19
• 10/28
• 5/14

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A bag has 3 red marbles, 2 blue and 4 yellow. What is the theoretical probability of pulling a red?

• 3/10
• 3/9
• 1/9
• 1/3

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An unlikely chance event is closer to what number?

• 0
• 1
• 2
• 3

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Find the experimental probability:

Roll dice: 1, 3, 3, 4, 4

P(1) =

• 3/5

• 1/6

• 2/5

• 1/5

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Is the spinner more likely or less likely to land on green than yellow?

• more likely
• less likely

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What is the probability of the spinner landing on red?

• 5/12
• 1/5
• 5/5
• 3/5

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A bag contains 1 red marble, 2 blue marbles, and 3 green marbles. What is the probability of picking a red marble?

• 1/6

• 1/3

• 1/5

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