Worksheet

Independent or dependent? Does putting it back matter?

Grade 8 Math Worksheet - Building Confidence

NameDate

Circle the best answer, or write your answer on the line.

  1. 2 red, 5 blue. Ari's bag holds 3 red and 5 blue marbles. Ari draws a red marble without looking and keeps it out. What is the chance the next draw is red, in simplest form?

  2. 3 green, 2 yellow. Bo's bag holds 4 green and 2 yellow marbles. Bo draws a green marble without looking and keeps it out. What is the chance the next draw is green, in simplest form?

  3. 2 red, 3 white (the red one went back). Esme's bag holds 2 red and 3 white marbles. Esme draws a red marble without looking and puts it back. What is the chance the next draw is red, in simplest form?

  4. 1, 2, 4, 5, 6, 7, 8, 9, 10. Jun has cards numbered 1 to 10 in a bag. Jun draws the card 3 without looking and keeps it out. What is the chance the next card is even, in simplest form?

  5. Kira rolls a fair number cube, then rolls it again. Are the two rolls independent or dependent?

    • Dependent: the second roll comes later than the first
    • Dependent: the same cube is used twice
    • Independent: the cube is the same for both rolls

  6. Noah's class draws two names from a hat, without looking, for two jobs. The first name is not put back. Are the two draws independent or dependent?

    • Independent: every name was in the hat at the start
    • Dependent: the first name stays out, so the hat changes
    • Independent: the jobs are different, so the names do not matter

  7. Pia's bag holds 5 red and 3 blue marbles. Pia draws a red marble without looking and keeps it out. What is the chance the next draw is red, in simplest form?

  8. Ren's bag holds cards numbered 1 to 6. Ren draws the card 2 without looking and puts it back. What is the chance the next draw is even, in simplest form?

  9. Tala's bag holds 4 blue and 4 green marbles. Tala draws a blue marble without looking and keeps it out. What is the chance the next draw is green, in simplest form?

  10. Zee's bag holds 2 red and 6 blue marbles. Zee draws a red marble without looking and keeps it out. What is the chance the next draw is red, in simplest form?

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Independent or dependent? Does putting it back matter?

Answer Key - Grade 8 Math Worksheet - Building Confidence

Circle the best answer, or write your answer on the line.

  1. 2 red, 5 blue. Ari's bag holds 3 red and 5 blue marbles. Ari draws a red marble without looking and keeps it out. What is the chance the next draw is red, in simplest form?

    2/7

  2. 3 green, 2 yellow. Bo's bag holds 4 green and 2 yellow marbles. Bo draws a green marble without looking and keeps it out. What is the chance the next draw is green, in simplest form?

    3/5

  3. 2 red, 3 white (the red one went back). Esme's bag holds 2 red and 3 white marbles. Esme draws a red marble without looking and puts it back. What is the chance the next draw is red, in simplest form?

    2/5

  4. 1, 2, 4, 5, 6, 7, 8, 9, 10. Jun has cards numbered 1 to 10 in a bag. Jun draws the card 3 without looking and keeps it out. What is the chance the next card is even, in simplest form?

    5/9

  5. Kira rolls a fair number cube, then rolls it again. Are the two rolls independent or dependent?

    • Dependent: the second roll comes later than the first
    • Dependent: the same cube is used twice
    • Independent: the cube is the same for both rolls

  6. Noah's class draws two names from a hat, without looking, for two jobs. The first name is not put back. Are the two draws independent or dependent?

    • Independent: every name was in the hat at the start
    • Dependent: the first name stays out, so the hat changes
    • Independent: the jobs are different, so the names do not matter

  7. Pia's bag holds 5 red and 3 blue marbles. Pia draws a red marble without looking and keeps it out. What is the chance the next draw is red, in simplest form?

    4/7

  8. Ren's bag holds cards numbered 1 to 6. Ren draws the card 2 without looking and puts it back. What is the chance the next draw is even, in simplest form?

    1/2

  9. Tala's bag holds 4 blue and 4 green marbles. Tala draws a blue marble without looking and keeps it out. What is the chance the next draw is green, in simplest form?

    4/7

  10. Zee's bag holds 2 red and 6 blue marbles. Zee draws a red marble without looking and keeps it out. What is the chance the next draw is red, in simplest form?

    1/7