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The mean of a grouped distribution is always:

Class 10Mean of Grouped DataStatistics and Probability
  • AExactly equal to the mean of the raw data
  • BAn approximation, assuming each class is concentrated at its class mark
  • CEqual to the modal class mark
  • DEqual to the median always

Step-by-Step Solution

Grouping loses individual values; we assume all observations of a class lie at its class mark, so the mean is an approximation.
Answer: B) An approximation, assuming each class is concentrated at its class mark

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