Problem-Solving and Data AnalysisEasy–MediumEstimating a school total from a sample
Problem-Solving and Data Analysis practice question
In a random sample of 80 students from a school of 1,200 students, 12 said they walk to school. Based on the sample, what is the best estimate of the number of students at the school who walk to school?
Answer: 180
12/80 = 15%, and 15% of 1,200 is 180.
Common wrong answers
- If you answered 12
- 12 is the count in the sample only.
- If you answered 15
- 15 is the percent, not the number.
- If you answered 120
- 120 is 10% of the school.
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