Question 1mediummultiple choice
Full question →Network Topology
- A
15
Why wrong: 15 is the quantity for OrderID 3 only.
- B
50
Why wrong: 50 is not the sum of the quantities.
- C
30
Why wrong: 30 is the sum of OrderID 1 and 2 only.
- D
45
10+20+15 = 45.
Question 902 of 976
Quick Answer
The correct answer is 45. This result comes from the SUM measure in Power BI, which aggregates all numeric values in the specified column; here, the TotalQuantity measure applies the SUM function to the Quantity column, adding the values 10, 15, 5, and 15 to reach a total of 45. On the Microsoft Power Platform Fundamentals PL-900 exam, this concept tests your understanding of how DAX measures perform simple aggregations, often presented with a small table exhibit where you must manually sum the values to verify the measure’s output. A common trap is miscounting or overlooking a row, so always double-check that every numeric entry in the column is included. To remember, think of SUM as a straightforward “add them all up” tool—no filters, no conditions, just pure arithmetic.
PL-900 Demonstrate capabilities of Power BI Practice Question
This PL-900 practice question tests your understanding of demonstrate capabilities of power bi. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Network Topology
Based on the exhibit, what is the result of the TotalQuantity measure?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
45
The TotalQuantity measure uses the SUM function on the Quantity column, which aggregates all numeric values in that column. Given the data in the exhibit, the sum of the Quantity values (10, 15, 5, 15) equals 45, making option D correct.
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.
- ✗
15
Why it's wrong here
15 is the quantity for OrderID 3 only.
- ✗
50
Why it's wrong here
50 is not the sum of the quantities.
- ✗
30
Why it's wrong here
30 is the sum of OrderID 1 and 2 only.
- ✓
45
Why this is correct
10+20+15 = 45.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse SUM with COUNT or average the values, leading them to pick 15 (a single row value) or 30 (a partial sum), rather than correctly aggregating all rows.
Detailed technical explanation
How to think about this question
In Power BI, the SUM function in DAX (Data Analysis Expressions) performs an additive aggregation over the specified column, ignoring blanks and non-numeric values. This is distinct from COUNT or COUNTROWS, which tally row counts. In real-world scenarios, using SUM incorrectly on a column with filters or implicit measures can lead to inaccurate totals, especially in complex models with relationships.
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.
TExam Day Tips
- 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
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FAQ
Questions learners often ask
What does this PL-900 question test?
Demonstrate capabilities of Power BI — This question tests Demonstrate capabilities of Power BI — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 45 — The TotalQuantity measure uses the SUM function on the Quantity column, which aggregates all numeric values in that column. Given the data in the exhibit, the sum of the Quantity values (10, 15, 5, 15) equals 45, making option D correct.
What should I do if I get this PL-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
1 more ways this is tested on PL-900
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A Power BI report uses a calculated column that shows [Sales Amount] * 1.1. Users notice the column shows incorrect values after a data refresh. What is the most likely cause?
hard- ✓ A.The DAX formula was edited to multiply by 1.2 instead of 1.1
- B.The dataset was refreshed in Import mode instead of DirectQuery
- C.The data type of 'Sales Amount' changed from decimal to integer
- D.The source column name changed from 'Sales Amount' to 'SalesAmt'
Why A: Option A is correct because if the DAX formula was edited to multiply by 1.2 instead of 1.1, the calculated column would produce values 9.09% higher than expected after the refresh. This directly explains the discrepancy users observe, as calculated columns are recomputed during data refresh based on the current formula definition.
Last reviewed: Jun 11, 2026
This PL-900 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PL-900 exam.
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