Averages — Quiz 1

Questions in this quiz (11)

1. What is the average (arithmetic mean) of $$\sqrt{0.81}$$, $$0.75$$ and $$\frac{4}{5}$$?

   • 0.75
   • 0.80
   • 0.82
   • 0.70

2. Calculate the average of the following three fractions:$$\frac{3}{4}$$, $$\frac{2}{5}$$, $$\frac{7}{10}$$.

   • $$\frac{37}{20}$$
   • $$\frac{37}{60}$$
   • $$\frac{7}{60}$$
   • $$\frac{3}{4}$$

3. If the average of $$a$$, $$b$$, and $$c$$ is $$22$$, what is their sum?

   • 33
   • 22
   • 66
   • 55

4. If the average of $$a$$ and $$b$$ is $$10$$, and the average of $$a$$, $$b$$, and $$c$$ is $$7$$, what is the value of $$c$$?

   • 20
   • 1
   • 21
   • 10

5. The average of $$7$$ consecutive even integers is $$10$$. What is the smallest of these integers?

   • 0
   • 4
   • 6
   • 10

6. In the table below, what was the average number of tickets sold per year during the period of 2010 through 2012?

   • 3000
   • 1800
   • 2400
   • 7200

7. The price of ABC stock showed some movement early this year. In April, it closed at $$4.00$$, in May it dropped to $$3.00$$, and in June it climbed to $$6.50$$. What was the average monthly change in the price of ABC stock from April through June?

   • -1
   • 1.25
   • -3.5
   • 3.5

8. On a recent science test, Alex scored 85, Brian scored 90, Chloe scored 87, and David scored 89. Emily was the only other student who took the test, and the average of all five scores was 88. What was Emily’s score?

   • 89
   • 87
   • 88
   • 85

9. Lena earned $$180$$, $$90$$, and $$150$$ from her last 3 tutoring sessions. She plans to tutor one more time next week. If Lena wants to average exactly $$160$$ across all 4 sessions, how much must she earn at her next session?

   • 180
   • 640
   • 420
   • 220

10. Mary ordered dinner for a party of 10 people. Three people ordered the $$4.75$$ chicken dinner, two people ordered the $$4.95$$ fish dinner, and five had the beef dinner at a cost of $$6.75$$ each. What was the average cost of each dinner at Mary's party?

    • 5.79
    • 9.9
    • 10
    • 14.25

11. The sum of the weekly salaries of 5 employees is $$3250$$. If each of the 5 salaries is to increase by 10 percent, then the average weekly salary per employee will increase by:

    • 325
    • 50
    • 70
    • 65