MLS-C01 Exploratory Data Analysis Practice Question
This MLS-C01 practice question tests your understanding of exploratory data analysis. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Exhibit
Refer to the exhibit. Consider the following output from an Amazon SageMaker Data Wrangler data quality report:
Column: 'age'
Missing: 2.3%
Mean: 38.5
Median: 37.0
StdDev: 15.2
Min: 0
Max: 120
Unique: 85
The exhibit shows a data quality report for a column named 'age'. Which potential data issue should be investigated further?
Exhibit
Refer to the exhibit. Consider the following output from an Amazon SageMaker Data Wrangler data quality report:
Column: 'age'
Missing: 2.3%
Mean: 38.5
Median: 37.0
StdDev: 15.2
Min: 0
Max: 120
Unique: 85
A
The mean and median are significantly different
Why wrong: Mean 38.5 and median 37.0 are close.
B
The minimum age of 0 and maximum age of 120 may be outliers
Age 0 and 120 are likely data errors.
C
The missing value rate of 2.3% is too high
Why wrong: 2.3% missing is relatively low.
D
The number of unique values (85) is too high
Why wrong: 85 unique ages is reasonable for a dataset.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The minimum age of 0 and maximum age of 120 may be outliers
Option B is correct. A minimum age of 0 and maximum age of 120 are potential data entry errors or outliers that warrant further investigation, as extreme values can skew analysis. Option A is incorrect because the mean and median being close suggests the distribution is relatively symmetric and not a data quality issue. Option C is incorrect because a missing value rate of 2.3% is generally considered low and may be handled without major concern. Option D is incorrect because 85 unique values for age is reasonable given the possible age range; it does not indicate a problem.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The mean and median are significantly different
Why it's wrong here
Mean 38.5 and median 37.0 are close.
✓
The minimum age of 0 and maximum age of 120 may be outliers
Why this is correct
Age 0 and 120 are likely data errors.
Related concept
Read the scenario before looking for a memorised answer.
✗
The missing value rate of 2.3% is too high
Why it's wrong here
2.3% missing is relatively low.
✗
The number of unique values (85) is too high
Why it's wrong here
85 unique ages is reasonable for a dataset.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Identify which MLS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Exploratory Data Analysis — This question tests Exploratory Data Analysis — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The minimum age of 0 and maximum age of 120 may be outliers — Option B is correct. A minimum age of 0 and maximum age of 120 are potential data entry errors or outliers that warrant further investigation, as extreme values can skew analysis. Option A is incorrect because the mean and median being close suggests the distribution is relatively symmetric and not a data quality issue. Option C is incorrect because a missing value rate of 2.3% is generally considered low and may be handled without major concern. Option D is incorrect because 85 unique values for age is reasonable given the possible age range; it does not indicate a problem.
What should I do if I get this MLS-C01 question wrong?
Identify which MLS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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