Idiot\'s Guides Basic Math and Pre-Algebra

324 Appendix A

11. The mode of {2, 2, 2, 3, 3, 4, 4, 4, 4} is 4.


12. B = {34, 54, 78, 92, 101} has no mode.


13. The mode of {3, 4, 5, 4, 7, 8, 9, 2, 10, 1} is 4.


14. D = {32, 34, 36, 38} has no mode.


15. The mode of {2, 2, 3, 4, 5} is 2.


16. For data set A, Q1 = 4, Median = 8.5,
    Q3 = 32.


17. For data set B, Q1 = 3, Median = 4,
    Q3 = 66.


18. For data set C, Q1 = 25, Median = 64,
    Q3 = 83.


19. George’s placement at the 54th percentile
    means that his score is slightly above the
    mean, but Harry’s 43rd percentile places him
    below the mean. George did better.

Chapter 20

1. For data set A, mean = 3.1


2. For data set B, mean = 71.8


3. For data set C, mean = 5.3


4. For data set D, mean = 35


5. For data set E, mean = 3.2


6. The median of {2, 2, 2, 3, 3, 4, 4, 4, 4} is 3.


7. The median of {34, 54, 78, 92, 101} is 78.


8. The median of {3, 4, 5, 4, 7, 8, 9, 2, 10, 1} is
   4.5.


9. The median of {32, 34, 36, 38} is 35.


10. The median of {2, 2, 3, 4, 5} is 3.

12.

13. Esther’s restaurant spending alternates large and small expenditures.


14. Esther’s spending varied by only 25 cents on August 4th and 8th and on August 7th and 10th.


15. Sales have the greatest positive change from June to July.


16. Sales had the steepest drop from August to September.


17. November had sales most similar to the number of hot dogs sold in February.

25

20

15

10

5

0

Esther’s Spending on Restaurant Meals

for the First 10 Days of August

Dollars

1-Aug 2-Aug 3-Aug 4-Aug 5-Aug 6-Aug 7-Aug 8-Aug 9-Aug 10-Aug