Which statement about the
pair of equations is true?
x = -2y + 300
3y = 800 - 4x
A) The equation pair has no solutions.
B)
The equation pair has many solutions.
C) The equation pair has exactly 1 solution.
D) The equation pair has exactly 2 solutions.
Benchmark Answers
Page 1 Page 2 Page 3 Page 4
1.A
7. D
12. B
17. B
2.C
8. C
13. D 18. A
3.B
9. B
14. B
19. A
4.A
10. D
15. C 20. B
5.C
11. A
16. B
Take your score, divide by 2
6.C
and that will be your bonus!
Unit 4 - Describing Data
• Central Tendancies : Mean, Median, Mode
• Spread: Q1, Q3, IQR, Min, Max, Range, MAD
• Graphs:
• Box-and-Whiskers
• Histograms
• Dot Plots
• Correlation: positive, negative, none
• Line of Best Fit
• Probability Tables: Joint, Marginal, Conditional
44
48
52
56
60
64
68
72
76
80
84
88
92
96
1) Identify the 1st quartile, 3rd Quartile and the
Median of the data.
1st: 68
3rd: 92
M: 84
2) What is the IQR of the data?
92 – 68 = 24
3) Find the Mean Absolute Deviation (MAD) of
the following data:
77, 48, 65, 80, 70
Mean: 68
9+20+3+12+2
5
9.2
4) How many cars get between 15 and 30 miles
per gallon?
4+4+2 = 10
Math
Social
Studies
P.E
Total
9th
50
18
40
108
10th
22
20
50
92
Total
72
38
90
200
5) What is the probability that a student
surveyed is a freshman? 108/200 = .54
6) If a student likes Math, what is the probability
that they are a sophomore? 22/72 = .31
7) Does the situation represent a positive,
negative or no correlation
a)
Number of hours studying for the SAT and your
score
positive
b)
The distance you drive and the number of stars in
the sky
no correlation
8) Tell if the situation is causation
a)
The number of boats on Lake Allatoona and
the number of cars on the street
no causation
b)
The hours you work and the money you
make
causation
c)
The time spent studying and the A on the
test
causation
9) Use the box plot to answer the following:
a) Which class has the largest minimum heart rate?
Class 3
b) Which class has the smallest lower quartile?
Class 1
10) Which of the following graphs has a
strong negative correlation?
A
B
C
D
11) The events x and y have a correlation
coefficient of 𝑟 = −0.19. What is the
relationship between x and y?
A. The events have a strong negative linear
relationship.
B. The events have a strong positive linear
relationship
C. The events have a weak negative linear
relationship
D. There is very little or no correlation.
12) Given the scatter plot, what is the best type
of function to represent the data?
A. Linear
B. Quadratic
C. Exponential
D. No Correlation
13) Between which of the following variables
would you expect there to be a positive
correlation?
A. The outside temperature and the number of layers
of clothing a person wears.
B. The number of students at Hillgrove and the
number of cats at the animal shelter
C. The number of cigarettes a person smokes and the
person’s life expectancy
D. The number of years spent in school and salary.
14) Which of the following is one of the 5
values needed to make a box-and whisker
plot?
A.
B.
C.
D.
Range
1st Quartile
Mode
Interquartile Range
15) Lauren asked five of her friends how long they
practiced shooting free throws and their shooting
percentage in the last 5 games. She found a linear
regression equation for the data to be
𝑦 = 10.5𝑥 + 50.6. What does the 10.5 mean in the
context of this equation?
A. That her friends shot an average of 10.5 free throws a
game.
B. That for every hour they practiced, their free throw
percentage went up 10.5
C. That they need to practice 10.5 hours a day to increase
their free throw percentage.
D. None of these
16) Ed and Dave each get paid a bonus at the
end of each month. This table shows their
bonuses:
Month
January
Februrary
March
April
May
June
July
Ed
$250
$290
$270
$240
$260
$270
$280
Dave
$250
$340
$310
$300
$260
$280
$270
a) Who had the
greater Median?
Ed – 270
** Dave – 280
b) Who had the
smaller Range?
** Ed – 50
Dave – 90
17)
a) Which shark lived longer than any other shark?
Whale Shark
b) About how long did the Basking Shark live?
32 years
c) Which Shark lived about one-third as long as the
Dusky Shark?
Hound Shark
18) Tell what kind of Correlation the graph has.
No
Correlation
Weak
Negative
Strong
Positive
Unit 4 EOCT
Practice
Problems
Practice Answers
1.C
2.C
3.B
4.C
5.B
6.A
7. A
8. A
9. C
10. A
11. B