L31 · Experimental probability

1. 1.

   A spinner is spun 80 times and lands on green 52 times. What is the experimental probability of green?

   Answer. 1320

   5280 = 1320.

2. 2.

   A spinner is spun 50 times and lands on green 16 times. What is the experimental probability of green?

   Answer. 825

   1650 = 825.

3. 3.

   A spinner is spun 50 times and lands on green 30 times. What is the experimental probability of green?

   Answer. 35

   3050 = 35.

4. 4.

   A spinner is spun 20 times and lands on green 12 times. What is the experimental probability of green?

   Answer. 35

   1220 = 35.

5. 5.

   A spinner is spun 20 times and lands on green 6 times. What is the experimental probability of green? Then Sam needs 2 of that amount. What is the total they need?

   Answer. 35

   620 = 310. Then multiply by 2: 35.

6. 6.

   A spinner is spun 50 times and lands on green 18 times. What is the experimental probability of green? Then Malik needs 4 of that amount. What is the total they need?

   Answer. 11125

   1850 = 925. Then multiply by 4: 11125.

7. 7.

   A spinner is spun 50 times and lands on green 16 times. What is the experimental probability of green? Then Theo needs 4 of that amount. What is the total they need?

   Answer. 1725

   1650 = 825. Then multiply by 4: 1725.

8. 8.

   A spinner is spun 20 times and lands on green 4 times. What is the experimental probability of green? Then Grace needs 4 of that amount. What is the total they need?

   Answer. 45

   420 = 15. Then multiply by 4: 45.

9. 9.

   A spinner is spun 50 times and lands on green 14 times. What is the experimental probability of green? Then Mei needs 5 of that amount. What is the total they need?

   Answer. 125

   1450 = 725. Then multiply by 5: 125.

10. 10.

    A spinner is spun 20 times and lands on green 5 times. What is the experimental probability of green? Then Elena needs 2 of that amount. What is the total they need?

    Answer. 12

    520 = 14. Then multiply by 2: 12.

11. 11.

    Think

    Nora tried this problem:
    A spinner is spun 20 times and lands on green 7 times. What is the experimental probability of green?
    Nora wrote 721. That is not correct. What is the right answer?

    Answer. 720

    Nora’s answer 721 is off. 720 = 720.

12. 12.

    Think

    Nora tried this problem:
    A spinner is spun 50 times and lands on green 19 times. What is the experimental probability of green?
    Nora wrote 1951. That is not correct. What is the right answer?

    Answer. 1950

    Nora’s answer 1951 is off. 1950 = 1950.

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