MATH 225 Week 3 Actual Exam 2026/2027 |
Verified Questions
Chamberlain University | Verified Q&A | University-Level Statistics Students
Introduction
Welcome to the comprehensive set of original verified questions compiled for the MATH 225 Week 3
Actual Exam 2026/2027. This preparation pack contains exactly 20 highly detailed questions designed to
reflect the rigorous curriculum and objectives of the official Chamberlain University MATH 225
Introduction to Statistics course blueprint. The questions are evenly distributed across four foundational
domains: Measures of Central Tendency and Position (5 questions), Measures of Dispersion and
Variability (5 questions), Basic Probability Concepts and Rules (5 questions), and Conditional Probability
and Independence (5 questions). This original content is designed to reinforce core statistical, analytical,
and probability competencies, providing University-Level statistics students with the problem-solving
mastery required to demonstrate academic readiness and secure successful placement in advanced Higher
Education medical research fields.
Domain: Measures of Central Tendency and Position
Question 1: [Sample Mean]
A clinical trial records the recovery times (in days) for a sample of 6 patients undergoing a
new therapeutic procedure: 5, 8, 4, 7, 9, and 9. What is the sample mean recovery time for
this group?
(A) 7.0 days
(B) 7.5 days
(C) 8.0 days
(D) 6.8 days
Correct Answer: A
Rationale: To calculate the sample mean, sum the recovery times and divide by the sample size (n = 6):
Sum = 5 + 8 + 4 + 7 + 9 + 9 = 42. Mean = = 7.0 days. This tests standard central tendency
calculations.
MATH 225 Week 3 Actual Exam 2026/2027
, Question 2: [Sample Median]
A nurse records the systolic blood pressure readings (in mmHg) of 7 hypertensive patients:
145, 138, 152, 160, 142, 135, and 148. What is the median systolic blood pressure of this
sample?
(A) 148 mmHg
(B) 145 mmHg
(C) 142 mmHg
(D) 145.7 mmHg
Correct Answer: B
Rationale: To find the median, first arrange the raw data in ascending order: 135, 138, 142, 145, 148,
152, 160. Since there is an odd number of data points (n = 7), the median is the middle value (the 4th
data point), which is 145 mmHg. This is a core position objective.
Question 3: [Sample Mode]
A pediatric ward records the primary symptoms of 10 children admitted during a shift:
Fever (F), Cough (C), Rash (R), Fever (F), Fever (F), Cough (C), Vomiting (V), Fever (F),
Rash (R), and Cough (C). What is the mode of this categorical data set?
(A) The data set has no mode.
(B) Cough (C)
(C) Rash (R)
(D) Fever (F)
Correct Answer: D
Rationale: The mode is the value that occurs most frequently in a data set. In this set, 'Fever' occurs 4
times, 'Cough' occurs 3 times, 'Rash' occurs 2 times, and 'Vomiting' occurs 1 time. Thus, the mode is
'Fever'. This tests categorical central tendency.
Question 4: [Percentiles and Quartiles]
A laboratory records the blood glucose levels (in mg/dL) of a group of patients: 75, 80, 85,
90, 95, 100, 110, and 120. Find the first quartile (Q1) of this ordered data set using the
standard locator method (L = 25/100 * n).
(A) 85.0 mg/dL
(B) 80.0 mg/dL
(C) 82.5 mg/dL
(D) 81.25 mg/dL
Correct Answer: C
Rationale: The data set has n = 8 sorted values: 75, 80, 85, 90, 95, 100, 110, 120. To find Q1 (the 25th
percentile), calculate the locator L: L = (25/100) * 8 = 2. Since L is an integer, the 25th percentile is the
average of the 2nd and 3rd values: (80 + 85) / 2 = 82.5 mg/dL. This is standard quartile calculation.
MATH 225 Week 3 Actual Exam 2026/2027
Verified Questions
Chamberlain University | Verified Q&A | University-Level Statistics Students
Introduction
Welcome to the comprehensive set of original verified questions compiled for the MATH 225 Week 3
Actual Exam 2026/2027. This preparation pack contains exactly 20 highly detailed questions designed to
reflect the rigorous curriculum and objectives of the official Chamberlain University MATH 225
Introduction to Statistics course blueprint. The questions are evenly distributed across four foundational
domains: Measures of Central Tendency and Position (5 questions), Measures of Dispersion and
Variability (5 questions), Basic Probability Concepts and Rules (5 questions), and Conditional Probability
and Independence (5 questions). This original content is designed to reinforce core statistical, analytical,
and probability competencies, providing University-Level statistics students with the problem-solving
mastery required to demonstrate academic readiness and secure successful placement in advanced Higher
Education medical research fields.
Domain: Measures of Central Tendency and Position
Question 1: [Sample Mean]
A clinical trial records the recovery times (in days) for a sample of 6 patients undergoing a
new therapeutic procedure: 5, 8, 4, 7, 9, and 9. What is the sample mean recovery time for
this group?
(A) 7.0 days
(B) 7.5 days
(C) 8.0 days
(D) 6.8 days
Correct Answer: A
Rationale: To calculate the sample mean, sum the recovery times and divide by the sample size (n = 6):
Sum = 5 + 8 + 4 + 7 + 9 + 9 = 42. Mean = = 7.0 days. This tests standard central tendency
calculations.
MATH 225 Week 3 Actual Exam 2026/2027
, Question 2: [Sample Median]
A nurse records the systolic blood pressure readings (in mmHg) of 7 hypertensive patients:
145, 138, 152, 160, 142, 135, and 148. What is the median systolic blood pressure of this
sample?
(A) 148 mmHg
(B) 145 mmHg
(C) 142 mmHg
(D) 145.7 mmHg
Correct Answer: B
Rationale: To find the median, first arrange the raw data in ascending order: 135, 138, 142, 145, 148,
152, 160. Since there is an odd number of data points (n = 7), the median is the middle value (the 4th
data point), which is 145 mmHg. This is a core position objective.
Question 3: [Sample Mode]
A pediatric ward records the primary symptoms of 10 children admitted during a shift:
Fever (F), Cough (C), Rash (R), Fever (F), Fever (F), Cough (C), Vomiting (V), Fever (F),
Rash (R), and Cough (C). What is the mode of this categorical data set?
(A) The data set has no mode.
(B) Cough (C)
(C) Rash (R)
(D) Fever (F)
Correct Answer: D
Rationale: The mode is the value that occurs most frequently in a data set. In this set, 'Fever' occurs 4
times, 'Cough' occurs 3 times, 'Rash' occurs 2 times, and 'Vomiting' occurs 1 time. Thus, the mode is
'Fever'. This tests categorical central tendency.
Question 4: [Percentiles and Quartiles]
A laboratory records the blood glucose levels (in mg/dL) of a group of patients: 75, 80, 85,
90, 95, 100, 110, and 120. Find the first quartile (Q1) of this ordered data set using the
standard locator method (L = 25/100 * n).
(A) 85.0 mg/dL
(B) 80.0 mg/dL
(C) 82.5 mg/dL
(D) 81.25 mg/dL
Correct Answer: C
Rationale: The data set has n = 8 sorted values: 75, 80, 85, 90, 95, 100, 110, 120. To find Q1 (the 25th
percentile), calculate the locator L: L = (25/100) * 8 = 2. Since L is an integer, the 25th percentile is the
average of the 2nd and 3rd values: (80 + 85) / 2 = 82.5 mg/dL. This is standard quartile calculation.
MATH 225 Week 3 Actual Exam 2026/2027
