Lean Six Sigma Green Belt – Green Belt Exam
2025 – Complete Solutions and Explanations
What is the Mean, Mode & Median for the data in Column 1, Data Set A?
a. Mean = 8.7, Mode = 8, Median = 7
b. Mean = 8.7, Mode = 7, Median = 8
c. Mean = 8, Mode = 8.7, Median = 7
d. Mean = 7, Mode = 7, Median = 8.7
e. Mean = 8, Mode = 8, Median = 7 - CORRECT - Answer B
Formula:
Mean = Sum(x)/n = 8.7
Mode = Most frequent value = 7
Median = because sample is even (n=50), the median is the average of the (n/2)th and
((n/2)+1)th values in the sorted series = 8
Please reference Quantifying Process Variability for more information.
A call center was experiencing customer complaints about time-on-hold and an improvement
team was formed to solve the problem. The manager of the call center joined the team's first
meeting and informed the team that their project would be short-lived because the obvious
solution to the time-on-hold problem was to add more phone lines. With this advice as a basis,
the team crafted a problem statement: "Additional phone lines are needed in order to reduce
the average customer time-on-hold from 6.2 minutes to our target of 45 seconds".
Which of the following best describes the problem statement?
,a. The statement is too broad to be useful in the particular situation.
b. The statement contains a solution.
c. The statement is not related to the problem described above.
d. This is a good problem statement.
e. The statement does not fully define "time-on-hold". - CORRECT - Answer B
The problem statement dictates that the solution is "additional phone lines". Please reference
Project Charter for more information.
What will a stakeholder analysis (RACI matrix) help the team do?
a. Narrow the project scope.
b. Reduce the likelihood of project roadblocks.
c. Choose effective team members.
d. Develop a focused problem statement.
e. Choose the most optimal project to pursue. - CORRECT - Answer B
A stakeholder analysis is used to 1) identify those entities that will have influence on the
project, 2) identify the type of influence and 3) develop strategies to realize the positive
influences and reduce any roadblocks due to the negative influences. Please reference
Stakeholder Analysis - RACI Matrix for more information.
When analyzing a process, which of the following terms represents the inputs?
a. f(X)
b. X
c. Y
, d. Result
e. Cost - CORRECT - Answer B
f(X) is the Transfer Function; Y is the process output, also sometimes referred to as the Result;
Cost could be either an input or output. Please reference Input Determines Output for more
information.
The fishbone diagram is used for which of the following?
a. To follow the movement of people in a process
b. To determine process capability
c. To categorize input variables that may be important
d. To prioritize the highest frequency problems
e. To show the process flow - CORRECT - Answer C
Please reference Cause & Effect Diagram Toolset for more information.
What is missing from the following Project Charter Business Case statement: "Process Cycle
Time must be reduced in order to meet customer requirements" ?
a. Team leader
b. Scope of project, including "included" and "not included"
c. Amount of improvement required and business impact
d. Measurement system to be used
e. Resources required - CORRECT - Answer C
2025 – Complete Solutions and Explanations
What is the Mean, Mode & Median for the data in Column 1, Data Set A?
a. Mean = 8.7, Mode = 8, Median = 7
b. Mean = 8.7, Mode = 7, Median = 8
c. Mean = 8, Mode = 8.7, Median = 7
d. Mean = 7, Mode = 7, Median = 8.7
e. Mean = 8, Mode = 8, Median = 7 - CORRECT - Answer B
Formula:
Mean = Sum(x)/n = 8.7
Mode = Most frequent value = 7
Median = because sample is even (n=50), the median is the average of the (n/2)th and
((n/2)+1)th values in the sorted series = 8
Please reference Quantifying Process Variability for more information.
A call center was experiencing customer complaints about time-on-hold and an improvement
team was formed to solve the problem. The manager of the call center joined the team's first
meeting and informed the team that their project would be short-lived because the obvious
solution to the time-on-hold problem was to add more phone lines. With this advice as a basis,
the team crafted a problem statement: "Additional phone lines are needed in order to reduce
the average customer time-on-hold from 6.2 minutes to our target of 45 seconds".
Which of the following best describes the problem statement?
,a. The statement is too broad to be useful in the particular situation.
b. The statement contains a solution.
c. The statement is not related to the problem described above.
d. This is a good problem statement.
e. The statement does not fully define "time-on-hold". - CORRECT - Answer B
The problem statement dictates that the solution is "additional phone lines". Please reference
Project Charter for more information.
What will a stakeholder analysis (RACI matrix) help the team do?
a. Narrow the project scope.
b. Reduce the likelihood of project roadblocks.
c. Choose effective team members.
d. Develop a focused problem statement.
e. Choose the most optimal project to pursue. - CORRECT - Answer B
A stakeholder analysis is used to 1) identify those entities that will have influence on the
project, 2) identify the type of influence and 3) develop strategies to realize the positive
influences and reduce any roadblocks due to the negative influences. Please reference
Stakeholder Analysis - RACI Matrix for more information.
When analyzing a process, which of the following terms represents the inputs?
a. f(X)
b. X
c. Y
, d. Result
e. Cost - CORRECT - Answer B
f(X) is the Transfer Function; Y is the process output, also sometimes referred to as the Result;
Cost could be either an input or output. Please reference Input Determines Output for more
information.
The fishbone diagram is used for which of the following?
a. To follow the movement of people in a process
b. To determine process capability
c. To categorize input variables that may be important
d. To prioritize the highest frequency problems
e. To show the process flow - CORRECT - Answer C
Please reference Cause & Effect Diagram Toolset for more information.
What is missing from the following Project Charter Business Case statement: "Process Cycle
Time must be reduced in order to meet customer requirements" ?
a. Team leader
b. Scope of project, including "included" and "not included"
c. Amount of improvement required and business impact
d. Measurement system to be used
e. Resources required - CORRECT - Answer C
