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Which of these would normally be collected as primary data by a class teacher?

Class 9Collection and Presentation of DataStatistics and Probability
  • AHeights of her own students measured in class
  • BGDP of India from a yearbook
  • CRainfall data from a weather website
  • DPopulation from the census report

Step-by-Step Solution

Data the teacher measures herself for her purpose is primary; the others are taken from existing published sources (secondary).
Answer: A) Heights of her own students measured in class

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