PERT Data Interpretation & Statistics 2 — Questions and Answers
Question 1: A data set has values 4, 8, 8, 10, 20. What is the median?
- 8 (Correct answer)
- 10
- 9
- 12
Correct answer: 8
The median is the middle value of the ordered set, which is 8.
Question 2: Which measure of center is most affected by an extreme outlier?
- Mean (Correct answer)
- Median
- Mode
- Range
Correct answer: Mean
The mean uses every value, so a single extreme outlier shifts it strongly.
Question 3: A bar graph shows sales of 30, 45, 25, and 50. What is the total?
- 150 (Correct answer)
- 140
- 160
- 120
Correct answer: 150
Adding 30 + 45 + 25 + 50 gives 150.
Question 4: What is the mode of the data set 2, 3, 3, 5, 7, 7, 7, 9?
- 7 (Correct answer)
- 3
- 5
- 9
Correct answer: 7
The value 7 appears most frequently (three times), so it is the mode.
Question 5: On a pie chart, a category occupies a 90° slice. What percent of the whole is it?
- 25% (Correct answer)
- 50%
- 30%
- 20%
Correct answer: 25%
90° out of 360° equals one quarter, or 25%.
Question 6: The range of the set 12, 18, 7, 25, 10 is what?
- 18 (Correct answer)
- 25
- 13
- 20
Correct answer: 18
Range equals the maximum (25) minus the minimum (7), which is 18.
Question 7: A line graph rising steadily from left to right indicates what about the data?
- An increasing trend (Correct answer)
- A decreasing trend
- No change
- A repeating cycle
Correct answer: An increasing trend
A line moving upward over time shows values that are increasing.
PERT Data Interpretation & Statistics 2
A data set has values 4, 8, 8, 10, 20.
What is the median?