The following smart chart lists the scores of three students in four quizzes: Student X: 10, 12, 9, 15 Student Y: 14, 13, 15, 10 Student Z: 9, 11, 12, 13 Which student has the highest average score?
Answer
Student Y
The correct answer is Student Y — Compare the three averages: Student Y has the highest average of 13.
Step-by-step solution
- Compute the average for Student X: (10 + 12 + 9 + 15) ÷ 4 = 46 ÷ 4 = 11.5.
- Compute the average for Student Y: (14 + 13 + 15 + 10) ÷ 4 = 52 ÷ 4 = 13.
- Compute the average for Student Z: (9 + 11 + 12 + 13) ÷ 4 = 45 ÷ 4 = 11.25.
- Compare the three averages: Student Y has the highest average of 13.
Common mistake: Computing the wrong average or misreading the chart entries
Concept tested: Comparing averages from smart chart
Published · How this solution was prepared and checked
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