MIA · Mixed set · Unit 7

1. 1.

   A bag has 3 red and 4 blue marbles. One marble is drawn at random. P(red)?

   Answer. 37

   Favorable 3 / total 7 = 37.

2. 2.

   A spinner is spun 80 times and lands on green 36 times. What is the experimental probability of green?

   Answer. 920

   3680 = 920.

3. 3.

   A fair six-sided die is rolled. P(even)?

   Answer. 12

   3 favorable outcomes out of 6 → 12.

4. 4.

   A bag has 5 green marbles out of 8. Two marbles are drawn with replacement. P(both green)?

   Answer. 2564

   58 × 58 = 2564.

5. 5.

   A bag has 3 red and 6 blue marbles. One marble is drawn at random. P(red)? Then Sam needs 4 of that amount. What is the total they need?

   Answer. 113

   Favorable 3 / total 9 = 13. Then multiply by 4: 113.

6. 6.

   A spinner is spun 20 times and lands on green 6 times. What is the experimental probability of green? Then Grace needs 5 of that amount. What is the total they need?

   Answer. 112

   620 = 310. Then multiply by 5: 112.

7. 7.

   A fair six-sided die is rolled. P(even)? Then Elena needs 3 of that amount. What is the total they need?

   Answer. 112

   3 favorable outcomes out of 6 → 12. Then multiply by 3: 112.

8. 8.

   A bag has 4 green marbles out of 7. Two marbles are drawn with replacement. P(both green)? Then Ava needs 2 of that amount. What is the total they need?

   Answer. 3249

   47 × 47 = 1649. Then multiply by 2: 3249.

9. 9.

   A bag has 3 red and 3 blue marbles. One marble is drawn at random. P(red)? Then Malik needs 3 of that amount. What is the total they need?

   Answer. 112

   Favorable 3 / total 6 = 12. Then multiply by 3: 112.

10. 10.

    A spinner is spun 40 times and lands on green 17 times. What is the experimental probability of green? Then Priya needs 5 of that amount. What is the total they need?

    Answer. 218

    1740 = 1740. Then multiply by 5: 218.

11. 11.

    Think

    Malik tried this problem:
    A fair six-sided die is rolled. P(1 or 2)?
    Malik wrote 14. That is not correct. What is the right answer?

    Answer. 13

    Malik’s answer 14 is off. 2 favorable outcomes out of 6 → 13.

12. 12.

    Think

    Grace tried this problem:
    A bag has 2 green marbles out of 7. Two marbles are drawn without replacement. P(both green)?
    Grace wrote 122. That is not correct. What is the right answer?

    Answer. 121

    Grace’s answer 122 is off. 27 × 16 = 121.

Original extra practice. Keys are computed from the items, not guessed.