MATH 225 Week 3 Actual Exam –
Chamberlain University – 2026/2027
Academic Year – Verified Questions
and Answers | with complete
solutions.
This practice exam is designed for the MATH 225 Week 3 Exam at
Chamberlain University for the 2026/2027 academic year. Based on available
course materials, Week 3 covers Descriptive Statistics, including
measures of central tendency (mean, median, mode), measures of
dispersion (range, variance, standard deviation), frequency tables,
histograms, and box plots .
SECTION 1: MEASURES OF CENTRAL TENDENCY
(Q1-Q20)
Q1. A researcher records the number of hours slept by 6 participants: 5, 8, 4,
7, 9, and 9. What is the mean hours slept for this sample?
A) 5.0 hours
B) 6.5 hours
C) 7.0 hours
D) 8.0 hours
Answer: C
Rationale: The mean is calculated by summing all values and dividing by the
number of values. Sum = 5 + 8 + 4 + 7 + 9 + 9 = 42. Mean = 42 ÷ 6 = 7.0
hours .
Source: MATH 225 Week 3 Practice Exam
,Q2. A researcher measures the heart rates (beats per minute) of 7
participants: 72, 68, 75, 80, 72, 74, and 76. What is the median heart rate?
A) 72 bpm
B) 74 bpm
C) 75 bpm
D) 76 bpm
Answer: B
Rationale: To find the median, arrange the data in ascending order: 68, 72,
72, 74, 75, 76, 80. With 7 values (an odd number), the median is the middle
value, which is the 4th value: 74 bpm .
Source: MATH 225 Week 3 Practice Exam
Q3. A data set contains the following values: 2, 4, 6, 8, 10, 12. What is the
mode of this data set?
A) 6
B) 7
C) No mode
D) 8
Answer: C
Rationale: The mode is the value that appears most frequently. Each value
in this data set appears exactly once, so there is no mode .
Source: MATH 225 Week 3 Practice Exam
Q4. A class of 10 students scored the following on a statistics quiz: 85, 90,
78, 92, 88, 76, 95, 89, 84, and 91. What is the 75th percentile (Q3) of these
scores?
, A) 85
B) 89
C) 91
D) 92
Answer: C
Rationale: Arrange scores in ascending order: 76, 78, 84, 85, 88, 89, 90, 91,
92, 95. Position = 0.75 × (n + 1) = 0.75 × 11 = 8.25. Interpolating between
the 8th value (91) and 9th value (92): Q3 = 91 + 0.25(92 − 91) = 91.25. The
closest option is 91 .
Source: MATH 225 Week 3 Practice Exam
Q5. A nurse records the body temperatures (°F) of 8 patients: 98.6, 99.2,
98.4, 98.8, 99.0, 98.6, 98.2, and 99.4. What is the sample mean
temperature?
A) 98.6°F
B) 98.8°F
C) 98.9°F
D) 99.0°F
Answer: B
Rationale: Sum = 98.6 + 99.2 + 98.4 + 98.8 + 99.0 + 98.6 + 98.2 + 99.4 =
790.2. Mean = 790.2 ÷ 8 = 98.775, which rounds to 98.8°F .
Source: MATH 225 Week 3 Practice Exam
Q6. A teacher randomly selects 10 out of her 30 students and finds that the
mean height of those 10 students is 5'2". Is this a sample mean or a
population mean, and which symbol would be used to denote it?
A) Population Mean, μ
B) Sample Mean, x̄
C) Population Mean, x̄
D) Sample Mean, μ
Chamberlain University – 2026/2027
Academic Year – Verified Questions
and Answers | with complete
solutions.
This practice exam is designed for the MATH 225 Week 3 Exam at
Chamberlain University for the 2026/2027 academic year. Based on available
course materials, Week 3 covers Descriptive Statistics, including
measures of central tendency (mean, median, mode), measures of
dispersion (range, variance, standard deviation), frequency tables,
histograms, and box plots .
SECTION 1: MEASURES OF CENTRAL TENDENCY
(Q1-Q20)
Q1. A researcher records the number of hours slept by 6 participants: 5, 8, 4,
7, 9, and 9. What is the mean hours slept for this sample?
A) 5.0 hours
B) 6.5 hours
C) 7.0 hours
D) 8.0 hours
Answer: C
Rationale: The mean is calculated by summing all values and dividing by the
number of values. Sum = 5 + 8 + 4 + 7 + 9 + 9 = 42. Mean = 42 ÷ 6 = 7.0
hours .
Source: MATH 225 Week 3 Practice Exam
,Q2. A researcher measures the heart rates (beats per minute) of 7
participants: 72, 68, 75, 80, 72, 74, and 76. What is the median heart rate?
A) 72 bpm
B) 74 bpm
C) 75 bpm
D) 76 bpm
Answer: B
Rationale: To find the median, arrange the data in ascending order: 68, 72,
72, 74, 75, 76, 80. With 7 values (an odd number), the median is the middle
value, which is the 4th value: 74 bpm .
Source: MATH 225 Week 3 Practice Exam
Q3. A data set contains the following values: 2, 4, 6, 8, 10, 12. What is the
mode of this data set?
A) 6
B) 7
C) No mode
D) 8
Answer: C
Rationale: The mode is the value that appears most frequently. Each value
in this data set appears exactly once, so there is no mode .
Source: MATH 225 Week 3 Practice Exam
Q4. A class of 10 students scored the following on a statistics quiz: 85, 90,
78, 92, 88, 76, 95, 89, 84, and 91. What is the 75th percentile (Q3) of these
scores?
, A) 85
B) 89
C) 91
D) 92
Answer: C
Rationale: Arrange scores in ascending order: 76, 78, 84, 85, 88, 89, 90, 91,
92, 95. Position = 0.75 × (n + 1) = 0.75 × 11 = 8.25. Interpolating between
the 8th value (91) and 9th value (92): Q3 = 91 + 0.25(92 − 91) = 91.25. The
closest option is 91 .
Source: MATH 225 Week 3 Practice Exam
Q5. A nurse records the body temperatures (°F) of 8 patients: 98.6, 99.2,
98.4, 98.8, 99.0, 98.6, 98.2, and 99.4. What is the sample mean
temperature?
A) 98.6°F
B) 98.8°F
C) 98.9°F
D) 99.0°F
Answer: B
Rationale: Sum = 98.6 + 99.2 + 98.4 + 98.8 + 99.0 + 98.6 + 98.2 + 99.4 =
790.2. Mean = 790.2 ÷ 8 = 98.775, which rounds to 98.8°F .
Source: MATH 225 Week 3 Practice Exam
Q6. A teacher randomly selects 10 out of her 30 students and finds that the
mean height of those 10 students is 5'2". Is this a sample mean or a
population mean, and which symbol would be used to denote it?
A) Population Mean, μ
B) Sample Mean, x̄
C) Population Mean, x̄
D) Sample Mean, μ
