Intro to Probability Practice

A regular 6-sided die is to be rolled once. What is the probability that a number less than 3 is rolled?

• 1/3

• 1/6

• 1/2

• 2/3

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A spinner has 8 equal regions. Each region is marked with one of the following numbers: 10, 20, 30, 40, 50, 60, 70, 80. What is the probability of an even number being spun on the first roll?

• 1/8

• 1/2

• 1

• 3/8

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There are 3 red marbles, 4 blue marbles, 2 green marbles, and 6 clear marbles in a burlap bag. One marble is randomly pulled from the bag. What is the probability the marble was green?

• 1/2

• 1/7

• 2/15

• 2/17

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If you select a marble without looking, how likely is it that you will pick a black one?

• certain

• probable

• unlikely

• impossible

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What is the probability of getting any letter that is not A?

• 6/8
• 3/4
• 2/8
• 1/4

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A jar contains 2 pink, 6 red, and 4 blue marbles. If you pick one marble without looking, what is the probability that the marble you pick will be red or blue?

• 5/6
• 1/2
• 1/3
• 1/6

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A box contains 3 black pens, 7 blue pens, and 5 red pens. Without looking, P(red or black)

• 8/15
• 15/225
• 5/15
• 3/15

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You flip a coin 20 times and record the results. Is this experimental or theoretical probability?

• Experimental
• Theoretical

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Probability is ...

• the chance that some event will occur.
• a game that involves coins.
• a guarantee.

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Which of the following statements is true?

• A valid probability will always be between -1 and +1

• An event that is impossible to occur has a probability of 1.00

• An event that must happen has a probability of 1.00

• In a valid probability model, all probabilities add to 100

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