Grade 9 Statistics & probability worksheet

What is on the worksheet

1. A bag contains 13 red counters and 18 blue counters. One counter is drawn at random. What is the probability of red?

2. Data: 23, 34, 45, 56, 67, 78, 89, 100. Using medians of the lower four and upper four values, find the interquartile range.

3. A bag contains 9 red counters and 25 blue counters. One counter is drawn at random. What is the probability of red?

4. P(A) = 5/18. Find P(not A).

5. Find the mean of 5, 19, 26, 25.

6. Data: 5, 6, 7, 8, 9, 10, 11, 12. Using medians of the lower four and upper four values, find the interquartile range.

7. P(A) = 29/34. Find P(not A).

8. A bag contains 17 red counters and 33 blue counters. One counter is drawn at random. What is the probability of red?

9. Find the median of 83, 10, 8, 33, 74.

10. A bag contains 23 red counters and 11 blue counters. One counter is drawn at random. What is the probability of red?

11. Find the median of 45, 82, 76, 10, 86.

12. Club A has 10 bus users and 9 walkers. Club B has 2 bus users. Given that a student is in Club A, what is the probability they use the bus? Give a simplified fraction.

13. A score of 12 occurs 3 times; a score of 30 occurs 1 times. Find the mean as a fraction or decimal.

14. Find the mean of 8, 37, 24, 46.

15. Find the median of 3, 36, 1, 30, 41.

16. Find the mean of 27, 50, 23, 43.

17. Find the median of 98, 32, 90, 29, 38.

18. Data: 9, 12, 15, 18, 21, 24, 27, 30. Using medians of the lower four and upper four values, find the interquartile range.

19. P(A) = 9/16. Find P(not A).

20. A score of 15 occurs 8 times; a score of 3 occurs 2 times. Find the mean as a fraction or decimal.