Independent and Dependent Probability

Which event is not a dependent event?

• Picking 2 students to each pass out notes and collect homework from a group of 20 students

• Picking 2 marbles from a bag without replacing the first marble

• Picking 2 crayons from a box at the same time (simultaneously)

• Picking an earring, replacing it, then picking a 2nd earring

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CCSS.7.SP.C.5

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Theoretical Probability is:

• What should happen.

• What may happen.

• What actually happens.

• What I want to happen.

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CCSS.7.SP.C.5

You spin this spinner 3 times.

Find the probability of these 3 events.

P(red, odd, 3)

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CCSS.7.SP.C.5

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A bag contains 5 quarters, 2 dimes, and 4 pennies. What is the probability of picking a quarter, not replacing it, and then picking a penny?

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CCSS.7.SP.C.5

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What is the probability of randomly selecting a striped marble, replacing it, and then selecting a solid marble?

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CCSS.HSS.CP.B.7

Mrs. Smith has to choose two pieces of fruit for her lunch. If she randomly takes two pieces of fruit from a bowl of 8 oranges and 8 apples, what is the probability she will choose two apples? (Mrs. Smith does not put back the first piece of fruit before she takes the second piece of fruit)

P(apple, apple)

• 25%

• 3%

• 23%

• 5%

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CCSS.HSS.CP.B.9

A coin is tossed and then the spinner is spun. Determine the probability that you toss Heads and spin a Red.

• 0.166667

• 0.25

• 0.10

• 0.83333

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CCSS.7.SP.C.5

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A farm has 5 brown cows and 10 white cows. A fence is open and two cows escape. What is the probability that it will be a brown cow, then a white cow?

• 11.1%

• 23.8%

• 33.3%

• 47.6%

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CCSS.7.SP.C.5

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A jar contains 2 pink, 6 red, and 4 blue marbles. If you pick two marbles without looking, what is the probability that the marble you pick will be red or blue and then without replacing it it a pink.

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CCSS.7.SP.C.5

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Ricardo has the spinner pictured here and a bag of marbles filled with 2 red marbles, 3 green marbles, and 3 blue marbles. What is the probability that Ricardo spins red on the spinner and picks a red marble out of the bag?

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CCSS.7.SP.C.5

CCSS.7.SP.C.7

CCSS.7.SP.C.8