Unit 7 Contents

6. Felicia's piano teacher has 8 students. Each student plays a song in the piano recital. The ages of the students are 7, 64, 10, 10, 11, 11, 6, and 9 years old.
1. Find the mean age of the students.
2. Find the median age.
3. If you could only use one number to represent the ages of the students in the recital, would you use the mean or the median? Explain.

Order of Operations

Find the value of the following expressions without a calculator. Then use a calculator to check your answers.

Hint: Check your calculator at home to see if it follows the correct order of operations. Use the same keystrokes you used in class:

If the calculator says the answer is 7, then it uses the correct order of operations.

7. 6 + 3 2 =
8. 12 ÷ 2 −
   3 =
9. 7 4 + 3 =
10. 10 −
    2 3 =
11. 32 + 30 ÷ 10 =
12. 5 −
    5 ÷ 5 5 + 5 =
13. 50 −
    9 ÷ 3 =
14. 18 −
    4 ÷ 2 6 =
15. (50 + 4) ÷ 9 =
16. 17 −
    20 ÷ 10 =
17. 12 ÷ (6 ÷ 2) =
18. (6 + 3) (7 −
    4) =
19. 12 ÷ (11 −
    6 + 1) =
20. 28 ÷ (11 −
    6 + 2) =
21. (17 + 4) ÷ 3 =
22. 17 −
    (64 ÷ 8) 2 =