MCQ
While computing mean of grouped data, we assume that the frequencies are:
  • A
    Evenly distributed over all the classes.
  • Centred at the class marks of the classes.
  • C
    Centred at the upper limit of the classes.
  • D
    Centred at the lower limit of the classes.

Answer

Correct option: B.
Centred at the class marks of the classes.
We know that while computing the mean of a grouped data, the frequencies are centered at the class marks of the classes.
Hence, the correct answer is option $(b).$

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