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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Theoretical Probability is:

• What should happen.

• What may happen.

• What actually happens.

• What I want to happen.

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You spin this spinner 3 times.

Find the probability of these 3 events.

P(red, odd, 3)

• 1/216

• 1/72

• 1/12

• 1/36

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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?

• 20/121

• 8/121

• 2/11

• 4/55

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

• 2/5

• 6/25

• 3/5

• 11/50

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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)

• 1/4

• 1/32

• 7/30

• 2/64

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Lisa flipped the same coin 3 times. What is the probability she obtained all tails?

• 1/2

• 1/16

• 1/4

• 1/8

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CCSS.7.SP.C.5

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

• 1/6

• 1/4

• 1/10

• 1/12

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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?

• 1/9

• 5/21

• 2/9

• 10/21

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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.

• 5/33

• 5/36

• 1/18

• 2/9

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CCSS.7.SP.C.5

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