NeSA NeSA Data Analysis & Statistics 1 — Questions and Answers
Question 1: A set of test scores is: 72, 85, 90, 68, 85, 92, 75. What is the mode?
- 72
- 85 (Correct answer)
- 90
- 75
Correct answer: 85
The mode is the value that appears most often; 85 appears twice while all others appear once.
Question 2: What is the median of the data set: 4, 7, 9, 12, 15?
- 7
- 9 (Correct answer)
- 10.5
- 12
Correct answer: 9
When arranged in order, the median is the middle value; the third value is 9.
Question 3: A bar graph shows that 15 students chose math, 10 chose science, and 5 chose art. What fraction of students chose art?
- 1/6 (Correct answer)
- 1/5
- 1/4
- 1/3
Correct answer: 1/6
Total students = 30; art fraction = 5/30 = 1/6.
Question 4: What type of graph is best for showing how data changes over time?
- Bar graph
- Pie chart
- Line graph (Correct answer)
- Pictograph
Correct answer: Line graph
Line graphs connect data points over time and clearly show trends and changes.
Question 5: A NeSA student's scores on 4 practice tests are 80, 90, 70, and 100. What is the mean score?
- 82
- 84
- 85 (Correct answer)
- 90
Correct answer: 85
Mean = (80 + 90 + 70 + 100) / 4 = 340 / 4 = 85.
Question 6: What is the range of the data set: 14, 22, 8, 35, 19?
- 19
- 21
- 27 (Correct answer)
- 35
Correct answer: 27
Range = maximum − minimum = 35 − 8 = 27.
NeSA NeSA Data Analysis & Statistics 1
A set of test scores is: 72, 85, 90, 68, 85, 92, 75.
What is the mode?