Probability and Compound Events

• 1/4
• 1/8
• 1/2
• 1/6

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• 1/2
• 1/8
• 1/3
• 1/12

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Two marbles are randomly drawn from a bag containing 3 purple, 1 blue, and 1 yellow marble. The first marble is blue and is not replaced. Find the probability of drawing a second marble that is purple. 

• 3/5
• 3/4
• 3/20
• 2/5

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An event that consists of two or more events

•  event
• dependent events
• experiment
• compound event

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How do you find compound probability?

• Multiply your probabilities
• Add your probabilities
• Divide your probabilities
• Subtract your probabilities

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If you pick a red marble and keep it, how does that change the probability of getting a green marble when you pick a second time?

• No change

• More likely

• Less likely

• Impossible

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A letter of the alphabet is chosen at random, then a coin is flipped. What is the probability of choosing a letter from the word MATH then getting tails? 

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• 1/13
• 5/13
• 5/26

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A number cube is rolled twice. What is the probability of getting a 6 on the first roll, then a number less than 5 on the second roll? 

• 2/3
• 5/36
• 1/9
• 1/36

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A chorus has 50 girls and 35 boys. If two are chosen at random to sing a duet, what is the probability that both will be boys? 

• 1/6
• 7/17
• 3/8
• 13/25

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Clara picks a marble at random, puts it back, and then picks another marble at random.

• Dependent
• Independent

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