Grade 12 Statistics & probability worksheet

What is on the worksheet

1. Data: 20, 26, 32, 38, 44, 50, 56, 62. Using medians of the lower four and upper four values, find the interquartile range.

2. Club A has 2 bus users and 17 walkers. Club B has 17 bus users. Given that a student is in Club A, what is the probability they use the bus? Give a simplified fraction.

3. Find the population variance of -4, 4, 12, 20, 28. Divide by 5.

4. Find the population variance of 13, 22, 31, 40, 49. Divide by 5.

5. How many ordered selections of 3 distinct items can be made from 9 items without repetition?

6. A score of 15 occurs 9 times; a score of 11 occurs 4 times. Find the mean as a fraction or decimal.

7. Find the population variance of 50, 56, 62, 68, 74. Divide by 5.

8. Data: 30, 36, 42, 48, 54, 60, 66, 72. Using medians of the lower four and upper four values, find the interquartile range.

9. How many ordered selections of 3 distinct items can be made from 12 items without repetition?

10. Club A has 24 bus users and 23 walkers. Club B has 14 bus users. Given that a student is in Club A, what is the probability they use the bus? Give a simplified fraction.

11. Club A has 19 bus users and 9 walkers. Club B has 10 bus users. Given that a student is in Club A, what is the probability they use the bus? Give a simplified fraction.

12. A score of 18 occurs 10 times; a score of 24 occurs 4 times. Find the mean as a fraction or decimal.

13. Find the population variance of 44, 52, 60, 68, 76. Divide by 5.

14. Club A has 16 bus users and 15 walkers. Club B has 16 bus users. Given that a student is in Club A, what is the probability they use the bus? Give a simplified fraction.

15. Find the population variance of 69, 70, 71, 72, 73. Divide by 5.

16. Data: 46, 53, 60, 67, 74, 81, 88, 95. Using medians of the lower four and upper four values, find the interquartile range.

17. Data: 31, 39, 47, 55, 63, 71, 79, 87. Using medians of the lower four and upper four values, find the interquartile range.

18. Find the population variance of 40, 48, 56, 64, 72. Divide by 5.

19. A score of 10 occurs 2 times; a score of 30 occurs 2 times. Find the mean as a fraction or decimal.

20. A score of 5 occurs 2 times; a score of 21 occurs 1 times. Find the mean as a fraction or decimal.