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Statistics
NCERT Exemplar Ch 12
CBSE_NCERT_EXEMPLAR_CH12
Grade 10
Question:
While computing mean of grouped data, we assume that the frequencies are:
Evenly distributed over all the classes Centered at the classmarks of the classes Centered at the upper limits of the classes Centered at the lower limits of the classes
Step-by-Step Solution
Key Concept: Standard statistical assumption in grouped frequency distribution.
Stepwise Solution:
All values falling in a class interval are assumed to be concentrated at its class mark (mid-point). [1.0 Mark]
Marking Scheme:
• Recalling grouped mean assumption: 1.0 Mark
Correct Answer:Centered at the classmarks of the classes
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