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Math 120 Chapter 3 Quiz
——————————————————————————————————————————From the given the frequency table
Value Frequency
9
12
15
16
23
1. (1 point) Find the mode.
2. (1 point) Find the median.
3. (1 point) Find the mean.
2
3
5
6
4
——————————————————————————————————————————4. (1 point) Your class grade consists of 40% homework, 25% quizzes, and 35% final exam. Suppose
you have earned 95% in homework and 84% in quizzes entering the final exam. What percentage do
you have to earn in the final in order to have an 87% overall percentage?
5. (1 point) Given the numbers 2, 5, 7, 8, 9, 10, 11, 12, 13, 15, 16, 18, 19, 20, 22. Find the percentile
rank of the number 11.
6. (1 point) Jimmy’s percentile rank was the 92nd in a class of 175 students. What was his class rank?
(Answer with a number: 1 = 1st, 2 = 2nd, 3 = 3rd, etc.)
7. (1 point) Given the numbers 2, 3, 4, 5, 7, 9, 10, 14, 15, 17. Find the five-number summary.
Low = _______, Q1 = _______, Median = _______, Q3 = _______, High = _______.
——————————————————————————————————————————The given pie graph shows the percentage of each of the three registered voter groups in a county.
Indep
27%
Demo
38%
Repub
35%
8. (1 point) It is known that there are 420 registered Republican voters. Find the total number of
registered voters.
9. (1 point) What is the number of independent voters?
10. (1 point) Which of the three bar graphs best represents the numbers of the three registered voter
groups?
(A)
(B)
(C)
500
50
500
400
40
400
300
30
300
200
20
200
100
10
100
0
0
Dem
Rep
Ind
0
Dem
Rep
Ind
Dem
Rep
Ind
——————————————————————————————————————————11. (2 points) Find the standard deviation for the following data. Round answer to the hundredth place.
10, 12, 14, 15, 16, 16, 36. (Do not round anything before you reach the final answer.)
——————————————————————————————————————————The scores of a standardized test are normally distributed with a mean of 600 points and a standard
deviation of 80 points. Use the normal graph provided below (also in the Notes, bottom of page 13) to
answer the following questions. Do not use a graphing calculator’s normal distribution function.
12. (1 point) What percent of test takers scored below 760?
13. (1 point) What percent of test takers scored above 840?
14. (1 point) What percent of test takers scored between 440 and 760?
15. (1 point) What percent of test takers scored below 440 OR above 760?
16. (1 point) If a student was told that she ranked at the 84th percentile, what was her test score?

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